From UO Second Age
With an offensive rating off the current scale, these are QUITE formidable enemies. They hit physically about as strong as the Knight-Errants, but the mana! Dear god, the mana! I've seen her drop 5 flamestrikes in a row on the stuff I had her provoked against. Have a high resist, or a lot of friends (preferably both) if ya wanna take on this queen of the snakes.
Inside and around the Terathan and Ophidian Fortresses in T2A
200 to 250 gold, Potions, Arrows, Gems, Scrolls (circles 3 to 7)