Obsidian Koi

Obsidian Koi is an Extinct-rarity fish from Emberreach in the Second Sea, and the wiki flags it as Unobtainable, so it is no longer something you can fish. It used to need Magnet bait, Windy weather and Summer, with no time-of-day restriction. The description is simple: a sleek fish with fins that flow like dark, polished glass.

It averaged 321 kg and reached 982.8 kg, ranking 171st of 663 fish by maximum weight, comfortably inside the top third. At C$5.395 per kg, an average catch was worth C$1,732, 272nd of the 742 documented fish, with 1,220 base XP. It was a solid mid-upper catch, never a headline one.

Its rarity neighbors in Emberreach were Firecrest and Glowfin Skipper, the other Extinct fish listed for the zone. Together they make up a short group tied to that part of the Second Sea.

Verdict: for a player who still has one, Obsidian Koi is a respectable piece worth around C$1,700. There is no method given to get another, so decisions about selling or keeping come down to collector preference. For everyone else, it is simply a record of a fish that has left the game's active catch list, and the right move is to focus on obtainable entries instead.