1) add more sacrifice skills
- hp sacrifice
- mp sacrifice
- regen sacrifice
- damage sacrifice
- defense sacrifice
- and more
- warriors- (weak against wizard damage and strong against archer damage)
- archers- (weak against whip master damage and strong against wizard damage)
- wizards- (weak against gunner damage and strong against whip masters damage)
- whip masters- (weak against warrior damage and strong against gunner damage)
- gunners- (weak against archer damage and strong against warrior damage)