Erik squared his shoulders and made his decision. Running wasn't an option. There were many reasons for that: the first was that he wanted to kill the creature, as simple as that. The second was that the creature was likely not going to leave him alone when he searched the building, which meant forcing him to fight. The third was that he needed to check the building for signs of his friends' presence, as old as it could have been.
Erik didn't want much; he just wanted some signs that his friends were alive, and hopefully, that could lead to their current position. If he didn't kill the creature, he could do nothing of that.
Erik channeled mana through his neural links, activating Absolute Castle. Light rippled across his skin as the power manifested, hardening into armor.
This power had resisted the Three-headed Void Ravagers and, to some extent, even the Cerulean Bird. Whatever this creature was, there was no way it could damage him.