Black Powder Bomb

Stealth

DC 15 (The three powder kegs aren't particularly well hidden, but they are out of sight to casual observation.)

Disable

No special skills are required to disable this manually activated trap. As an Interact action, a PC can sweep aside some black powder to interrupt the fuse line, but this doesn't prevent Gerhard from activating a keg via blunderbuss. A keg that is removed from its position (either by being thrown over the cliff or merely carried away) retains its explosive potential, but as long as one of the three kegs are removed they no longer have the precise placement required to trigger a collapse—an explosion at this point merely inflicts fire damage in the appropriate areas but does not particularly damage the temple structure itself.