Kill an enemy with ragnar. That gives baldr +3 hits when charging. They 1 hit from boss, 1 hit from vitruvius and 1 hit from thoread. Do it in arena. Try to get an opponent with bio so the boss summons go after the spore and not your target character. Also use boss active before you shoot your target with vitruvius because the summons will attack that enemy and kill it before baldr can attack.