Ooo I have an idea. Once you hit 1500 posts you get the "deity" title which right now is the Legifer icon, but you should be able to pick which deity icon you use
Any victory gets my respect. I've beaten the game a few times, but never with natural limbs.
For the mage level, I like to have an enchanted cloak of electricity resistance. It helps to teleport yourself to *them* asap instead of waiting for them to come to you, that way you can slaughter them while they're all grouped together. As long as they don't teleport your cloak away, the rest of the equipment isn't crucial (by then your limbs should be strong enough to kill them easily without a weapon) and you can recover it once they are all dead.
As for Oree, my experience has been that if you make it to him, he's childsplay in comparison.
For taking on Petrus - it's been a while, but I think I had one victory over him, but it was in LIVAN which changes the balance of the game significantly. Basically though, time is everything - the longer you wait the stronger you get. Just wait until you think you're ready, then play for like 6 more months, then you'll actually be ready.