WELL without his powers nerfed Luke is super-good for a couple of things. First of all, this asshole can teleport. It's very vague how this is done seeing how it happens after he cuts a slash through the air and then just...shimmers away...but it's close enough to teleportation you can get!

He also has heightened senses of persuasion and the ability to automatically sense traps, monsters, non-mortals, etc. What this means is that he can basically get anyone to do anything and also he'll be able to sense where drones/traps/etc are.

Additionally he's still able to steal anything without notice and his ability to break locks will be unlocked so he can do it more than once. Overall he's not that useful but it's something. The persuasion thing might help with nightmare cradles maybe? TADA.