Cornyx of The Great Swamp is a merchant in Dark Souls 3. He’s an old pyromancer – he can help you with pyromancy flame upgrades, as well as new spells from Pyromancy Tomes.
You’ll have to find him first, and let him come to Firelink Shrine. This guide will show you where to find Cornyx the Pyromancer in Dark Souls 3.
Cornyx the Pyromancer Location
He can be found in the Undead Settlement area. He’s trapped in a cage – you’ll have to rescue him if you want to recruit him. There’s no special story or quest tied to him, but you’ll need him if you want to use fire magic. He’s pretty much necessary, since the only other NPC that sells these spells is found in the last third of the game.
He starts off with only 4 fire spells, but he can read most of the Pyromancy Tomes. You can also buy a Pyromancer outfit from him (the one with the crown), or use Titanite Shards to reinforce your flame.