Rooms

Rooms are tiles you can place in your dungeon that either allow you to populate with units, apply damage or negative status effects, or buff your own units.

Battle Rooms
Battle Rooms are able to hold up to 3 monsters in a room (with some exceptions). These rooms let monsters battle enemy heroes and are the common rooms to use. The Dark Lord Room is a special battle room in which the Dark Lord is able to fight in addition to using her mana abilities. This room can hold up to 5 monsters, unlocked though the Original and Awakening pack upgrades.

Traps
Trap Rooms are not able to house any monsters, but rather deal damage or apply negative status effects to heroes which may walk over it. These can be walked over many times and some may effect adjacent rooms, but traps can also be dodged with Dodge Trap.

Facilities
Facilities are not very common rooms to come across and usually give a passive effect, which usually affect the monsters in the dungeon.

Corruption Rooms
There are two rooms involved in corruption: The Prison allows you to imprison prisoners that you are able to get at the end of battle rewards and higher tiers of prison may even give bonus effects.
 * Prison
 * Altar (not to be confused with the altar room type).

The Altar allows you to collect souls, which can be acquired after heroes die in adjacent rooms. Souls are needed to corrupt heroes as well as turn monsters into orbs.

Note: These cannot be succeeded and can only be found on Trial difficulty and Legend difficulty

Shrines
Shrines are rooms which give bonus effects to heroes which enter the room. They are basically reverse traps and are also able to be reactivated many times. You generally want to remove these, but there are two relics that give bonus combat capabilities to monsters that make altars possibly favourable.

Corruption Shrine is the only one that debuff heroes and is also the only Shrine that can level up.