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.