One thing I found kinda odd, is that after stepping into the final dungeon till the end of the trial, it's near identical in style to Shadowbringer.

1: The dungeon is a history tour, narrated by the villain. (Final days / doomed civilizations)
2: At the end of the dungeon, the villain starts picking off the Scions with spells in a cutscene.
3: Someone comes to the WoL's aid (G'raha / Shinryu)
4: Trial is against a wall boss (Hades did have a non-wall boss phase) with some similar attack patterns (middle/sides)
5: A fade to black after the ultimate attack and a power-up after that, going into a simple final phase.