The ability to change, add and remove properties from any object in my near vicinity; the catch is: I can only change one property at a time. Also, since I get affected as well, doing stuff like removing the property of breathability of the air might not always be a good idea.
what is your name?
Cat-Alyst
what are your powers (and how did you get them)?
I can perform transmutation, alchemy... But only when a catalyst is near. Meaning, a cat.
So basically, if the cat gets afraid of what you're doing and runs away, you lose all your power. And if it comes too close to you, you get distracted because you want to pet it...and lose your powers in the process. Do I understand that correctly? :P