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Berserker shows incredibly adept technical skills in battle despite his madness due to Eternal Arms Mastership, allowing him to put to use all of his skills in weaponry despite not being capable of fully rational thought.
His mastery of the combat arts is at the level where he was unrivaled within his era. Due to the complete unification of mind, body, and technique, he displays flawless fighting skill even under the influence of any sort of mental hindrance. Though he attacks ferociously like a beast, befitting his class, all his attacks are accurate and precise enough to push even the strongest Servants back, and he can perform seemingly impossible maneuvers normally requiring complex thought purely on instinct, surprising onlookers due to his nature as a mad warrior.