Drow interior tileset

The Drow Interior tileset was introduced with the Hordes of the Underdark Expansion pack and describes the following themes:

Features

 * Cell (1x1)
 * Corridor Stairs Down (1x1)
 * Corridor Stairs Up (1x1)
 * Door Transition (1x1)
 * Room (1x1)

Groups

 * Bedroom (1x2)
 * Drow Temple (3x4)
 * Room (1x2)
 * Under Well (3x4)

Terrain

 * 2x2 Room - Don't know why this isn't just called room or Floor 3
 * Corridor
 * Doorway
 * Floor
 * Floor 2