Berserker

Shielder	Saber	Archer	Lancer
Rider	Caster	Assassin	Berserker
Ruler	Avenger	Moon Cancer	Alter Ego
Beast		Foreigner

—Mad Warrior and Heroic Spirit of Berserker Rage. Crazed warriors that have lost almost all traces of their sanity in exchange for great power.—

Berserkers have a base damage multiplier of 1.1x.

All Classes except Shielder and Foreigner take 50% more damage from Berserkers, including other Berserkers.
Foreigners take half damage from Berserkers.
Berserkers take double damage from all Classes except Shielder and Berserkers.

Heracles	Lancelot	Lu Bu Fengxian	Spartacus	Sakata Kintoki
Vlad III	Asterios	Caligula	Darius III	Kiyohime
Eric Bloodaxe	Tamamo Cat	Frankenstein	Beowulf	Nightingale
Cú Chulainn (Alter)	Minamoto no Raikō	Ibaraki Dōji	Mysterious Heroine X (Alter)	Hijikata Toshizō
Chacha	Penthesilea	Paul Bunyan	Oda Nobunaga (Berserker)	Atalanta (Alter)
Jeanne d'Arc (Berserker Alter)