Can be a noun or verb, and called sanctuary, sanc, or sancing.
verb- "I really have to go sanctuary, can you point me to the nearest restroom?"
So basically, Magnus and the like live in this huge, fantastic, castle known as the Sanctuary. The Sanctuary is also home to what the team lovingly refer to as abnormals.
Abnormals are basically any type of creatures not found in nature or cooler versions of X-Men.