[Try creating barriers. Multiple layers of them. The attribute drain doesn't affect brain crystal powers, remember? The barriers might buy us time.]
[Then you pray for the Chimaeric Demons to kill more of these fuckers!]
Erik didn't have neural links in the absolute wall brain crystal power. He didn't have the time, nor the will, to make more, since he had to prepare for the journey to Mur, yet he still got a lot of mana, so he was bound to be useful to a certain point. The problem was that he was the only one with the power, and to protect the entire army alone, he was bound to have a massive mana drain.