Here, rather than tender memories being projected onto the crystals like in the case of Zodiark, Hydaelyn’s Crystal Memoria showcases the bloodiest moments of human history while “proud angels” and sin eaters rampage through the zone. It is abundantly clear that Hydaelyn/Venat views these struggles as little more than entertainment and that she considers it a lot more “fun” compared to life in the Unsundered World despite the carnage. Her mental state is explored in that she feels that her hands are clean because she merely “guided” people into doing the things they did in these conflicts rather than taking on an active role, leading the party to question whether or not her behavior is all that different from Emet’s. They come to the conclusion that it is different, for while Emet was desperately trying to bring back his loved ones for thousands of years, Hydaelyn inflicted this torment onto humanity for her own vanity.
Eventually the party comes before the Mothercrystal and the WoL uses the blessing of darkness to shatter it, while the spirit of Emet-Selch looks on. The crystal disintegrates and Hydaelyn emerges from it, unfurling her wings and looking down at the WoL with cold eyes. She again remarks on their progress and how far they’ve come, and the party declares their resolve to fight against her and free the star from her influence. Hydaelyn attacks them without warning and Meteion leaps in front of the WoL to take the hit intended for them. This shocks and enrages the party, who immediately retaliate. Vrta reverts to dragon form and lunges at her only for Hydaelyn to encase him in a block of crystal, and casts down the remaining other party members before challenging “Azem” once more.
A 3 phase fight ensues, with the first phase taking place at the “Lake of Ice” as seen in the original Endwalker MSQ. The 2nd phase involves her subjugating and riding away on Midgardsormr in order to escape the WoL’s final blow and recover her health. By this point Vrtra breaks free of his crystal prison and lets the WoL on their back in order to pursue his father. They are accosted by the last of Hydaelyn’s sin eaters in this add phase before the dragons both release their riders from their backs and send them plummeting towards the surface of the moon. Hydaelyn’s wings are damaged by the fall and is thus forced to fight on land with no means of escape, and in her frenzy nearly overpowers the WoL. Themis and Hythlodaeus release themselves from crystal stasis in order to hold her back while the WoL deals damage to her, but both are ultimately sacrificed in order to render her vulnerable. With one final blow, the WoL slays Hydaelyn who disperses into light and moondust.