"arbalester" is a character costume in StrikeForce Kitty.
The fox wearing the costume is found on level one with "billy" near the end of the level. Wearing the set requires defeating the fox multiple times until all three pieces are obtained.
Costume set contains three pieces: helmet, leather armor, and crossbow. "arbalester" does ranged damage and has the special ability to attack again at a 30% chance.