Err, you've got enought power there that you don't need most of it to fill up a class (even a monster class). You just have to spread it around, tbh. Oh, and I'm a veteran oldschool resist-corrosion stacker, you seem to be looking for one (even though almost everyone who responded including the nice man who is interested in the nice sprites, and who is in fact one of the developers, are all probably adept at it
) Do tell the nice man about the sprites, please
As for the class:
Don't add more corrosive strike as conversion bonus. Regular corrosive strike allready scales with a lot of stuff, making it scale directly with CP would get ludicrous really fast and requires too many crippling penalties. The way you got it set up makes the little bugger too self sufficent and all the penalties required make the abilities too crammed and meh. Gorgon's a fun class, but boy does it look like a disjointed mess when you try to make sense of her abilities...
Plain old corrosive strike is plenty (well, if you pad it out with martyr wraps, EM or Whargarble / fireballs quite a bit more than plenty). The guy with corrosive strike will either want a way to hit stuff a lot and that basicaly means resistances. Otherwise and/or also an alternative way to apply corrosion.
So what I'd try would be:
1) Corrosive strike. Poison Strike lvl 1 just so Glowing Guardian hates him.
2) Starts with PISSORF. Pissorf applies corrosion.
3) 20% ish starting resists both, reduced initial mana pool
CP bonus: 2% Resists, starts off costing very little CP, scales by some ammount. CP are easy to cheeze up (to ludicrous ammouts) as we've recently discovered, but since you can get resists high as f**k on anything anyway, why not give this guy a way to do it built in. Have to prevent him from worshiping GG because that'd be like rewarding him with piety for boosting his resistances.
Would be a mean critter. I'd go somewhere along those lines, although there probably could be some clause added which would incentivise leveling the bastard up at all. But much cleaner overall. If you wanna brawl (lol, first time I ever used that term) you go looking for resists, if you want to spellcast you go looking for more mana. If he's too good, make the pissorff unconvertible so as to take up an item slot which also hampers resist stacking shennanigans and carrying disposable conversion fodder around for too long before you convert it.
Not sure if he'd need a damage penalty at all this way. If he's hitting stuff without a natural way of boosting health regeneration he'll be sucking up blackspace like silly and run out if he's not careful. If he's using pissorff, pisorff already has a built in damage penalty. If he's using everything, well, you've juggling stuff, it's probably fun.