Crusader

Crusaders are the unpopular branch of the cleric class. They have no EP heal, have weaker heals for using hammers with half mAtk of stalves, and as a damage dealer they are by far weak compared to gunners, mages, shadows, gladiators. This class is neither as,strong as priests as a support class nor as strong as a warrior class. It is somewhere in between. Play this class at your own risk as players tend to switch to priest class eventually.

Crusaders Staff vs Hammer
The main reason why crusaders should use hammers is because Second Class Skills require an equipped hammer for defense (goat) and offense (holy cross). Crusaders using stalves will be able to use non-hammer skills and better heals but will not be able to use Second Class skills.