Master Gregory Vrill MPG, Guildmaster of the Grito/Greyhelm Potion Guild, Mage
Okay, I need to 'retcon' here. I was concerned that the DM wouldn't understand the rules of stoneskin, so I was going to drink a healing potion, but instead I'll use a potion of firebombing and kill Ruy Lopez. The guy only has 10 hp or something, and my firebomb potion does 5d6... that's 17 hp, sorry Ruy. You're a completely illegal magic item anyway.
That goes down in round 2, so cancel all +3 bonuses IN round 2 and AFTER round 2 ALSO.
Your lame game has always played that you can drink 2 potions if that's your full round action, not including movement and innate powers, and it just so happens I have a lot of potions from my job, so fuck off Marivhon.
If the dispel magic goes off I'll drink another potion of levitation, otherwise I'll drink a potion of charm person and charm Marivhon and have him start stunning his lame friends. In any case, I lightning bolt Marivhon and Brogg and miss Ron Ball no problem. Line through any two points and all that.
I'll remind you that I'm effectively 12th level from the +1 potion, and in addition, I get a bonus die (to 11) and a +1 on each die for the lightning bolt. I don't care if Marivhon misses it, he's got a low WI so he's probably going to be charmed if that happens. Brogg takes 42 save for 21.
Time to start killing PCs. If Marivhon isn't charmed, then, in round 3 I'll magic missile him. If he is charmed, I'll magic missile Brogg until he's dead, even if he's unconscious. If he's unc, then I'll send missiles at him til dead and the rest at Dave FoO. Here are the missiles... I get 6, and each is +2: 4, 4, 5, 3, 3, 5. WEAK. Total Dmg is 24, unless only two of them go to Brogg to kill him, then it's 16.