This location is the battle ground during the quest The Reviving Legend.

It is just a boss battle with some reinforcements:

The 2 union reinforcements can be skipped if the initial 3 waves are terminated at once (Arcana or Gae Bolg).

It is recommended to take out the Hypnos and Amoeba unions before attacking the Evil Eye as the Eyes don't attack until a union is within range or engaged.

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