Michael pushed through the Undead masses for a while before replenishing his used-up energy with Inferior Energy Stones. Once he was filled to the brim with energy, Michael returned to search for the strongest Undead forces again.
He didn't want to waste his time, but it was not like he would ignore the Undead Higher Lifeforms that entered his path. He killed a bunch of Bone Titans, some Undead Awakened, and a bunch of other Undead before he made his way to a mountain range covered in sand.
"Am I right here?"
[Yep. The hidden valley of the Sacred Desert should be around here. Look out for a magic cir–...Ah. There it is!]
Michael's eyes landed on a small portion of the mountain range. Sand covered a large gate that had been built into the mountain range. If not for Spirit Eyes, Michael wouldn't have found it.