That's actually his MP that are being refilled.

Learn how to find and defeat the Majin High Priest in Shin Megami Tensei III: Nocturne HD Remaster. Get tips on his location and strategy.

So, you just took down Dante – pretty cool, right? He introduces himself and explains he was after your Menorah too, but he’s heading off to investigate the old man’s scheme. Don't worry, this is your only mandatory encounter with him. If you skip the bonus Maniacs dungeon, you won't see him again!

Now, a new Majin, the High Priest, is ready to rumble. Kamara will give you a hint: he’s “somewhere with a tall building.” You’ll find him in Ikebukuro, specifically in the east wing, past the Mantra HQ, and close to the stairs leading to the second floor.

When you approach him, the High Priest will do a bit of monologuing about death and destruction – standard villain stuff, really. He’ll then offer to “show you the way to death,” which is his way of saying he’s about to attack you. Get ready!