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Fire Emblem Warriors: Three Hopes - The Loop
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You see a lava lurker attendant.
Notes
It's a weaker form of a Lava Lurker, but it is only encountered as summons from Floating Savants.
Abilities
Unknown.
Damage Taken From Elements
Physical 

Death 

Holy 

Ice 

Fire 

Energy 

Earth 

Location
Behaviour
Unknown
Strategy
Unknown