Skeletons were closing the position, it was just an endless army so big that was letting almost no space in the room while the Elder Lich was flying.
With the Mandrake Shield, he blocked the attacks from the skeletons but they were already getting on his back. Mandrake Shield was absorbing all the attacks but was not enough to defend Gremory from an army.
"CHARGE" He screamed, releasing the attacks absorbed by the shield into a huge blast, killing many skeletons. But still, he would not be able to recover not even after this battle since the skeletons had no dark energy at all.
But they kept coming, the small space opened by the blast from the shield was taken just a few seconds later while Gremory turned his back to face the other part of the army.
However, again he was completely surrounded, and again he defended the most he could before using the charge from the shield again.