Astaroth didn't give Regius time to recover as he used a combination of his open hand and the club to swing while Regius fed mana into Monarchae Furia to recharge permanence while he used just the handle portion to fend off the club. Regius was missing his mech, as well as the petal spell and elemental overload. With his new body and the mana body technique, his body maintained the pinnacle of power for his rank. Regius' body was comparable to an artifact of the same tier, but he wasn't facing an enemy of the same tier in the least. This was a genuine demigod with the strength to back it up.