Master Dungeoneer
15th-Level Artificer, Dungeoneer Feature
You have become a master of Dungeoneering. Beginning at
15th level, creatures have disadvantage on saving throws for
your Dungeoncraft Objects and Dunegoneer spells.
In addition, you learn to cast a ritual version of both the
passwall and wall of stone spells. Casting them in this way
takes 1 hour, doesn't consume a spell slot, and the structure
created becomes permanent at the end of the ritual casting.