Calamity
Octanya
The Evil Sea God
Octanya Conqueror
Share of all DRAPLINE players who have this achievement.
Octanya Conqueror — "Defeated Octanya the Evil Sea God" — is held by 39.9% of players. Not a calamity dragon: the achievement describes a sea god, fought somewhere on the same route.
What is not documented
Everything about Octanya beyond the achievement name and its unlock rate is unpublished. That includes the element, the fight window, and the moveset. Sites that print those details are extrapolating from the same fragment we have — the difference is that we label it as missing.
If you have fought Octanya and can describe the encounter, that is exactly the kind of detail this page is waiting for.
Achievement and unlock rate: Steam Community global achievements, 2026-09-29. Profile text: in-game Compendium, transcribed via the Fandom wiki. No details have been inferred for entries the game does not describe.