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The Hibernating Leviathan

The Hibernating Leviathan (boss), a Firnreach enemy, standing on packed snow in daylight.

Boss

The Hibernating Leviathan

Threat: Extreme

An orange cone fills in front of it for 2 s: get your buildings out of it - the frost breath hits everything inside. An orange ring under a gun means that gun is about to freeze; carried guns never do.

The drill woke it. It freezes guns with a look, breathes frost through walls and drinks the warmth from what it breaks. It won’t breathe on the Base; it wants what the Base is singing.

Siege: an icy beam freezes your nearest gun for 3 s, and a warned frost-breath cone hits every structure in it for 300 (never the Base). Life Siphon: heals for a fifth of the damage it deals to buildings. Carried guns are never frozen - pick one up.

Type Boss
Threat Extreme
Base HP 8000
Speed 0.5
Damage 10
Crystal drop 750

Base values: difficulty and the wave number scale them up.