The Gorgon Warmistress is the third boss you will face and its element is Water/Earth so it is weak against Air and Spirit. You can face it in the Relic Ruins and at the Summoning Stone. If you beat it 10 times, you will get the achievement Gorgon Gladiator.

Gorgon Warmistress Edit

Gorgon Warmistress
Element: Water/Earth

Max health: 142

Drops: Snakeskin Leather Strips and Stone Slabs

Exp: 173

Summon cost: 6 Gems