Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - Help/Tips/Tricks Gargoyle Maze - no reward triggered? (spoilers)

You have to find a way to get inside the tower to get some gears (and fight some undead).

The easiest way to do this is get the ring first so the gargoyle teleport you right into entrance of the tower. (You get ring as a part of the story progression if you use the default route to beat Act 1)

The vault to an item is inside there.