[...Blood magic? Whatever that is, it sounds unpleasant. Maybe this guy will be more prepared than most for all the craziness that haunts the ship.

He's dying to ask for a bit more explanation, but he figures he should answer the question first.]

It's for... a few things. The number gives you your locker--that's where your stuff'll be--and your room. The actual tattoo itself has these nanite... things in it. They unlock doors and all that. And they poisoned us once. Don't ask me how they work.