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1 Half-Tulpa will emerge during the challenge at intervals. After some time, the Hydro Tulpa will absorb Half-Tulpas to enhance itself: It will grow larger, its ATK will increase, and it will launch more dangerous attacks.
Use attacks or Elemental Reactions to destroy Half-Tulpas in time or Freeze them to interrupt this absorption.

Starts in the Geohuman form, which possesses higher All Elemental and Physical RES. After it takes a certain number of Pyro DMG instances, it will completely enter its Molten Dragon form, in which All Elemental and Physical RES apart from Pyro RES is greatly decreased. After it goes on to take Pyro DMG, it will progressively take additional DMG. If it takes a certain number of additional Pyro DMG instances while in Molten Dragon form, it will enter Overburn, falling down and becoming immobilized. This will also cause its All Elemental and Physical RES to be further decreased. After being immobilized for a time, it will return to Geohuman form.

After taking Hydro DMG or Cryo DMG, it will gradually return to the higher-RES Geohuman form.

Will enter Sweeper Mode while in combat: All Elemental and Physical RES is greatly increased, and it will generate Flow Momentum while performing attacks. The higher its Flow Momentum, the faster it will rotate and the more DMG it will deal.
It will lose Flow Momentum after taking Cryo DMG. Below a certain Flow Momentum value, it will stop rotating and attacking, and its All Elemental and Physical RES will be greatly decreased, with its Cryo RES decreasing still more.

If an active character enters and maintains the Nightsoul's Blessing state for a time, this opponent will enter Counterstrike Mode and switch to attacking with tracking rays. At this time, its All Elemental and Physical RES will be decreased.
In this state, after it takes a certain number of Cryo DMG instances, it will cease attacking altogether and its All Elemental and Physical RES will be further decreased.