Buried Treasure 1.7.6

[Unmaker]

When entering new levels with Wraithform active, dungeon objects may be placed in diggable squares instead of in the open corridors and rooms. This includes chests and other features like glowstones.

Addendum: If a chest is supposed to spawn enemies and there are no actual clear tiles within 1 of the chest, the enemies will not show. They do not show up on the rest of the level either, so this is a good/bad way to lose XP and loot.