Ways to enter the planes:
- Portals, conduits and gates are possible entrances.
- Portals: Players can cast a portal and perhaps randomly arrive there. Other may be a portal that is through a "door" that appears random or placed somewhere but a key of some type is needed to open it. This portal disappears for a time after being entered.
- Conduits-the colors pools in the Astral plane would be a conduit. A whirpool that appears, etc.
- Gate-perhaps a "wild magic" of the gate spell?

Planes

Mirror

A hall of mirrors that leads to various planes.
At times one of these works as a real mirror that duplicates the player but reverses the alignment and makes the "mob" hunt and attack the player.

Empty plane of darkness, shadows cast with no light source.
Connects through Portals or Gates, also through darkness (maybe darkness spells by some classes?)
No Colors Exist, how can we do this?
Mainly neutral aligned mobs.
Enhanced Shadow magic by spells that are shadow while on this plane at no higher mana cost.
Spells that cast light or fire are weaker or may fail completely. Light sources should be downgraded when here.

Mobs:
- Ghirrash-Siz-limbed tigerlike fiends
- Khumat-Crocodilian fiends
- Thaskor-Elephantine fiends
- Shadow Eft