ProbonkBeta

Endgame. This is content the game holds back until every gate is cleared. The name below, and everything after it, describes the last hours of the story.

Zmey, the Unbidden

Found in
Beneath Marrow Keep, once all three branches are severed

Zmey, the Unbidden is one of 45 bosses in Mortal Shell 2, fought in Beneath Marrow Keep, once all three branches are severed.

Effect

The last fight of the main story: a malformed parasitic dragon that drops from the underside of Marrow Keep. Long reach and wide area attacks, and almost nothing to answer you with while you stand directly underneath it. Less durable than the Monolith, so it is a shorter fight than it looks.

Elsewhere in the wiki