diff --git a/README.md b/README.md
index f389d4f..44d8d83 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ uv tool install paskia
 
 ## Configuration
 
-Bootstrapping is done once with `paskia init`; after that, `paskia` serves all configured realms from the database `paskia.kantadb` in the current directory. Realm configuration (rp-name, auth host, origins) is managed via the admin web interface, including adding further realms (rp-ids).
+Bootstrapping is done once with `paskia init`; after that, `paskia` serves all configured domains from the database `paskia.kantadb` in the current directory. Domain configuration (rp-name, auth host, origins) is managed via the admin web interface, including adding further domains (rp-ids).
 
 ```text
 paskia init [options]    # one-time bootstrap
@@ -63,10 +63,10 @@ paskia [-l endpoint]     # serve
 | init option | Description | Default |
 |--------|-------------|---------|
 | -l, --listen *endpoint* | Listen address: *host*:*port*, :*port* (all interfaces), or */path.sock* (stored in the database) | **localhost:4401** |
-| --rp-id *domain* | Main/top domain for passkeys. Repeatable and comma-separated for multiple realms; the first is the default realm | **localhost** |
-| --rp-name *"text"* | Branding name of the default realm (passkey auth, login dialog) | Same as rp-id |
-| --origin *url* | Only sites listed can login on the default realm (repeatable) | rp-id and all subdomains |
-| --auth-host *url* | Dedicated authentication site, e.g. **auth.example.com** | Use **/auth/** path on each site |
+| --rp-id *domain* | Main/top domain for passkeys. Repeatable and comma-separated for multiple domains | **localhost** |
+| --rp-name *"text"* | Branding name of the first domain (passkey auth, login dialog) | Same as rp-id |
+
+Origins, auth hosts and related domains are configured afterwards in the admin panel's Domains section.
 
 The `paskia` serve command accepts only `--listen` (overriding the stored value) and never converts databases: with no `paskia.kantadb` it tells you to run `paskia init`, or `paskia migrate` when a legacy `{rp-id}.paskiadb` database is present. `paskia migrate` converts the legacy database; with several candidates, `--rp-id` selects one by name and the rest are left in place.
 
@@ -217,13 +217,13 @@ auth.example.com {
 
 Now all authentication happens at `auth.example.com` instead of `/auth/` paths on your apps. Your existing protected sites continue to work as before but they just forward to the dedicated site for user profile and other such functionality.
 
-Set the auth host in the admin panel's Realms section, or pass `--auth-host=auth.example.com` to `paskia init` when bootstrapping.
+Set the auth host in the admin panel's Domains section.
 
-## Multiple Realms and Related Origins
+## Multiple Domains and Related Origins
 
-One Paskia instance can serve several realms (rp-ids) from the same database: users, orgs and permissions are shared, while passkeys are registered per realm. The master admin adds realms in the admin panel's Realms section; no restart is needed.
+One Paskia instance can serve several domains (rp-ids) from the same database: users, orgs and permissions are shared, while passkeys are registered per domain. The master admin adds domains in the admin panel's Domains section; no restart is needed.
 
-A realm can also let *other* domain names use its passkeys via WebAuthn [Related Origin Requests](https://passkeys.dev/docs/advanced/related-origins/) — add them as related domains in the realm settings, and paskia serves the required `/.well-known/webauthn` declaration on the realm's domain. This is separate from the allowed-sign-in-sites list, which only restricts which subdomains of the realm's own domain may authenticate (empty = the domain and all subdomains).
+A domain can also let *other* domain names use its passkeys via WebAuthn [Related Origin Requests](https://passkeys.dev/docs/advanced/related-origins/) — add them as related domains in the domain settings, and paskia serves the required `/.well-known/webauthn` declaration on the domain's main site. This is separate from the allowed-sign-in-sites list, which only restricts which subdomains of the domain's own rp-id may authenticate (empty = the rp-id and all subdomains).
 
 See [Multi-Site documentation](docs/MultiSite.md) for details.
 
diff --git a/docs/API.md b/docs/API.md
index 25db48c..fe58881 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -94,7 +94,7 @@ These are for internal use only, but are documented here because they are the co
 
 ### Auth host mode (dedicated auth site)
 
-A domain may configure a dedicated authentication host (auth-host, a subdomain of the rp-id), either at bootstrap (`paskia init --auth-host`) or via the Domains admin panel.
+A domain may configure a dedicated authentication host (auth-host, a subdomain of the rp-id) via the Domains admin panel.
 
 #### On the auth host:
 - The Web UI is served at site root instead of /auth/* (that redirects to root paths)
diff --git a/docs/MultiSite.md b/docs/MultiSite.md
index d1ee310..0b1a297 100644
--- a/docs/MultiSite.md
+++ b/docs/MultiSite.md
@@ -194,10 +194,10 @@ instance:
   - `--rp-id`: repeatable/comma-separated, default `["localhost"]`.
     Multiple values create multiple domains at once (useful for
     devserver/e2e).
-  - `--rp-name`, `--auth-host`, `--origin`: apply to the **first**
-    rp-id only. Their purpose is that the very first admin registration
-    ceremony already shows the correct RP name; everything is editable
-    via the admin interface afterwards.
+  - `--rp-name`: applies to the **first** rp-id only. Its purpose is that
+    the very first admin registration ceremony already shows the correct
+    RP name; everything else (origins, auth hosts, related domains) is
+    set up via the admin interface afterwards.
   - `--listen`: stored into `Config.listen` (process-global).
   - Seeds the admin user + registration reset link and prints the link.
     Refuses to run if `paskia.kantadb` already exists, or if an
@@ -466,10 +466,9 @@ effective_auth_host(domain) = domain's own auth host or first configured one or
 ## 12. Development
 
 - `scripts/devserver.py`: bootstraps via one-shot `paskia init` when no
-  database exists (multi `--rp-id`, and `--rp-name`/`--auth-host`/
-  `--origin` for the first domain), then runs plain `paskia` serve.
-  Caddy dev origins iterate all bootstrap rp-ids plus the auth host and
-  explicit origins.
+  database exists (multi `--rp-id`, `--rp-name` for the first domain),
+  then runs plain `paskia` serve. Caddy dev origins iterate all bootstrap
+  rp-ids.
 - `PASKIA_AUTH_HOST` (consumed by `frontend/vite.config.js`) is a
   comma-separated list of bare hostnames; the vite dev proxy forwards
   `/.well-known/openid-configuration` and `/.well-known/webauthn` to the
diff --git a/docs/proxy/caddy.md b/docs/proxy/caddy.md
index 64aae65..4361f2d 100644
--- a/docs/proxy/caddy.md
+++ b/docs/proxy/caddy.md
@@ -81,7 +81,7 @@ auth.example.com {
 }
 ```
 
-Remember to set the auth host for the domain — either `paskia init --auth-host auth.example.com` at bootstrap or in the admin panel's Domains section — to restrict the authentication services to this domain.
+Remember to set the auth host for the domain in the admin panel's Domains section to restrict the authentication services to this domain.
 
 Note that we still reserve `/auth/` on each site for logout page and any APIs your application may require, while full user profile and global options are only available on the auth host.
 
diff --git a/docs/proxy/traefik.md b/docs/proxy/traefik.md
index e2681ee..0ec971a 100644
--- a/docs/proxy/traefik.md
+++ b/docs/proxy/traefik.md
@@ -92,7 +92,7 @@ authResponseHeaders:
 
 The `/auth/` router above forwards all authentication UI, API, and WebSocket traffic to Paskia. Because this router does **not** use the `paskia-auth` middleware, users can reach the login page and profile UI without being authenticated first. Traefik handles WebSocket upgrades automatically when the client requests them.
 
-If you are using a dedicated authentication host instead of `/auth/`, create a separate router for `auth.example.com` pointing to the Paskia service and set the domain's auth host (`paskia init --auth-host auth.example.com` at bootstrap, or the admin panel's Domains section).
+If you are using a dedicated authentication host instead of `/auth/`, create a separate router for `auth.example.com` pointing to the Paskia service and set the domain's auth host in the admin panel's Domains section.
 
 ## Adjusting requirements
 
diff --git a/paskia/__main__.py b/paskia/__main__.py
index 7601c9c..ecdff4f 100644
--- a/paskia/__main__.py
+++ b/paskia/__main__.py
@@ -12,21 +12,17 @@ from kanta import Kanta
 from paskia.db import legacy
 from paskia.db.bootstrap import bootstrap, log_reset_link
 from paskia.db.paths import db_file_path
-from paskia.db.structs import DB, Config, DomainConfig, OriginEntry
+from paskia.db.structs import DB, Config, DomainConfig
 from paskia.domains import build as build_registry
 from paskia.domains import configure as configure_domains
-from paskia.domains import origin_key, validate_config
+from paskia.domains import validate_config
 from paskia.util import startupbox
 from paskia.util.constants import DEFAULT_PORT, DEVMODE
-from paskia.util.hostutil import (
-    normalize_origin,
-    validate_auth_host,
-)
 from paskia.util.runtime import ServeConfig
 
 EPILOG = """\
 Examples:
-  paskia init --rp-id example.com --rp-name "Example Corporation" --auth-host auth.example.com
+  paskia init --rp-id example.com --rp-name "Example Corporation"
   paskia migrate --rp-id example.com
   paskia
 """
@@ -93,27 +89,16 @@ def cmd_init(args: argparse.Namespace) -> None:
 
     rp_ids = _split_multi(args.rp_id) or ["localhost"]
 
+    # Only rp-id and rp-name are bootstrap-time configuration; everything
+    # else (origins, auth host, related domains) is set up afterwards via
+    # the admin interface.
     domains = {}
     for i, rp_id in enumerate(rp_ids):
         domain = DomainConfig()
         if i == 0:
-            # Bootstrap-time naming and hosts apply to the first domain;
-            # everything is editable via the admin interface afterwards.
+            # The bootstrap rp-name exists so the very first admin
+            # registration ceremony already shows the correct name.
             domain.rp_name = args.rp_name or None
-            origins = {
-                origin_key(normalize_origin(o)): True
-                for o in _split_multi(args.origins)
-            }
-            auth_host = args.auth_host or None
-            if auth_host:
-                try:
-                    validate_auth_host(auth_host, rp_id)
-                except ValueError as e:
-                    raise SystemExit(str(e)) from e
-                if "://" not in auth_host:
-                    auth_host = f"https://{auth_host}"
-                origins[origin_key(auth_host)] = OriginEntry(auth_host=True)
-            domain.origins = origins
         domains[rp_id] = domain
 
     config = Config(domains=domains, listen=_split_multi(args.listen) or None)
@@ -228,27 +213,14 @@ def main():
         "--rp-id",
         action="append",
         help="Relying Party ID of the initial domain(s) (default: localhost). "
-        "Repeatable and comma-separated; bootstrap options apply to the first. "
-        "Further domains are added via the admin interface.",
+        "Repeatable and comma-separated. Further domains, origins and auth "
+        "hosts are added via the admin interface.",
     )
     init_parser.add_argument(
         "--rp-name",
         help="Relying Party name of the first domain (default: same as rp-id). "
         "Used by the initial admin registration; editable later via admin UI.",
     )
-    init_parser.add_argument(
-        "--origin",
-        action="append",
-        dest="origins",
-        metavar="URL",
-        help="Allowed origin URL(s) for the first domain. May be specified "
-        "multiple times; comma-separated values accepted.",
-    )
-    init_parser.add_argument(
-        "--auth-host",
-        help="Dedicated authentication site for the first domain "
-        "(optionally with scheme/port)",
-    )
     _add_listen_option(init_parser, help_extra=" (stored in the database)")
 
     migrate_parser = argparse.ArgumentParser(
diff --git a/paskia/util/hostutil.py b/paskia/util/hostutil.py
index 1dea746..1deaff4 100644
--- a/paskia/util/hostutil.py
+++ b/paskia/util/hostutil.py
@@ -55,21 +55,6 @@ def is_subdomain(sub: str, domain: str) -> bool:
     return sub_parts[-len(domain_parts) :] == domain_parts
 
 
-def validate_auth_host(auth_host: str, rp_id: str) -> None:
-    """Validate that auth_host is a subdomain of rp_id.
-
-    Raises ValueError on invalid auth_host.
-    """
-    parsed = urlparse(auth_host if "://" in auth_host else f"//{auth_host}")
-    host = parsed.hostname or parsed.path
-    if not host:
-        raise ValueError(f"Invalid auth-host: '{auth_host}'")
-    if not is_subdomain(host, rp_id):
-        raise ValueError(
-            f"auth-host '{auth_host}' is not a subdomain of rp-id '{rp_id}'"
-        )
-
-
 def auth_host_netloc(auth_host: str) -> str | None:
     """Return the host[:port] part of a configured auth host URL."""
     parsed = urlparse(auth_host if "://" in auth_host else f"//{auth_host}")
diff --git a/scripts/devserver.py b/scripts/devserver.py
index 78214d0..489fb67 100755
--- a/scripts/devserver.py
+++ b/scripts/devserver.py
@@ -167,10 +167,6 @@ def ensure_database(rp_ids: list[str], args: argparse.Namespace, listen: str) ->
         cmd.extend(["--rp-id", rp_id])
     if args.rp_name:
         cmd.extend(["--rp-name", args.rp_name])
-    if args.auth_host:
-        cmd.extend(["--auth-host", args.auth_host])
-    for origin in _split_multi(args.origins):
-        cmd.extend(["--origin", origin])
 
     logger.info(">>> paskia init (first run)")
     proc = subprocess.run(cmd, check=False)  # noqa: S603
@@ -199,24 +195,13 @@ async def run_devserver(args: argparse.Namespace, remaining: list[str]) -> None:
     os.environ["PASKIA_VITE_URL"] = viteurl
     os.environ["PASKIA_BACKEND_URL"] = backurl
     os.environ["PASKIA_DEV"] = "1"
-    if args.auth_host:
-        os.environ["PASKIA_AUTH_HOST"] = args.auth_host
 
     async with ProcessGroup() as pg:
         # Start Caddy first if requested (needs to bind ports)
         if args.caddy:
             caddy_origins = []
-            if args.auth_host:
-                auth_host = args.auth_host
-                if "://" not in auth_host:
-                    auth_host = f"https://{auth_host}"
-                caddy_origins.append(auth_host)
             for rp_id in rp_ids:
                 caddy_origins.append(f"https://{rp_id}")
-            for origin in _split_multi(args.origins):
-                if "://" not in origin:
-                    origin = f"https://{origin}"
-                caddy_origins.append(origin)
             seen: set = set()
             caddy_origins = [x for x in caddy_origins if not (x in seen or seen.add(x))]
             caddy_proc = await run_caddy(caddy_origins, viteurl, backurl)
@@ -251,20 +236,11 @@ def main():
         "--rp-id",
         action="append",
         help="Relying Party ID(s) for first-run bootstrap (default: localhost). "
-        "Repeatable and comma-separated; the bootstrap name/host options apply to the first.",
+        "Repeatable and comma-separated.",
     )
     parser.add_argument(
         "--rp-name", help="Relying Party name of the first domain (bootstrap only)"
     )
-    parser.add_argument(
-        "--origin",
-        action="append",
-        dest="origins",
-        help="Allowed origin(s), bootstrap only",
-    )
-    parser.add_argument(
-        "--auth-host", help="Dedicated auth host for the first domain (bootstrap only)"
-    )
     args, remaining = parser.parse_known_args()
 
     with suppress(KeyboardInterrupt):
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 74d19e8..daea0eb 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -20,7 +20,7 @@ from kanta import Kanta
 
 from paskia.__main__ import _load_stored_config, main
 from paskia.db import legacy
-from paskia.db.structs import Config, OriginEntry
+from paskia.db.structs import Config
 from paskia.util.runtime import ServeConfig, clear_cache
 
 
@@ -98,10 +98,6 @@ def test_init_full_options(run_cli, tmp_path):
         "example.com",
         "--rp-name",
         "Example Corp",
-        "--auth-host",
-        "auth.example.com",
-        "--origin",
-        "https://app.example.com",
         "--listen",
         "4402",
     )
@@ -109,10 +105,7 @@ def test_init_full_options(run_cli, tmp_path):
     config = stored_config(tmp_path)
     domain = config.domains["example.com"]
     assert domain.rp_name == "Example Corp"
-    assert domain.origins == {
-        "app.example.com": True,
-        "auth.example.com": OriginEntry(auth_host=True),
-    }
+    assert domain.origins == {}
     assert config.listen == ["4402"]
 
 
@@ -135,9 +128,12 @@ def test_init_refuses_legacy_database(run_cli, tmp_path):
         run_cli("init")
 
 
-def test_init_invalid_auth_host(run_cli):
+def test_init_rejects_removed_options(run_cli):
+    """Origins and auth hosts are admin-interface configuration, not init's."""
     with pytest.raises(SystemExit):
-        run_cli("init", "--rp-id", "example.com", "--auth-host", "notsub.example.org")
+        run_cli("init", "--rp-id", "example.com", "--auth-host", "auth.example.com")
+    with pytest.raises(SystemExit):
+        run_cli("init", "--origin", "https://app.example.com")
 
 
 def test_serve_requires_database(run_cli):