Catapults are the only units who are able to destroy Crypt fortificatons by using their special attack. Their only attack is a special that costs 10 souls. It throws stones to the castle, massively damaging it. The catapult is the only unit that can not be upgraded in the armory. It is only used on Catapult castle crush. Their max HP is low, so be careful with them. They're also expensive, costing a total of 100 gems. To train another one, you have to wait even longer than for the dragon.
Doesn't do a normal attack just an attack by its special