The High Priestess can be difficult considering how easy it is to lose track of where the character os especially during her second phase.
During her first phase she'll switch to the left and right platform once, making enough room to knock down her health to enter the second phase. When she's on the platform she'll cast a spell to send rubble towards the warrior, standing on the same platform she will avoid any damage from the rubble. The second phase is more so figuring out where to move and to always be aware that the Priestess can remove a platform at will. Stay ahead and remember left side is Red while right is Blue. The final phase has the priestess teleport into the center and cast a beam attack. Watch what color she is and match that color. When the first beam attack is over quickly move up a platform and attack her. After two beam attacks she'll switch up colors again but the basic pattern will remain the same.
