Spoilerish...
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You are speaking about AC, not THAC0, aren't you?
You can not wear 2 rings of protection at the same time. This is the drawback

Instead, you may wear the Ring Of Gaax
To boost your AC (and saving throws sometimes

) quaff a potion of defence, invulnerability or such. Wear the Cloak of Sewers. Shield amulet may come in handy too
Some girdles grant you a great bonus to AC agains a certain type of weapons. My favorite is the one granting a bonus vs. slashing weapons.. Big men wielding swords are no longer a threat
Use your Kai to make sure the battle will not last long
ADD]Cloak of Sewers is found in the sewers in Temple District, on a rakshasa surrounded bu some kobolds. Not very difficult
Shield amulets are spread allthrough the game. I encountered 2-3 of them. They should not be too difficult to find.
The girdle I am talking about is the Golden Girdle, aquired in the Planar Sphere (if you do all the quests properly)
Also try Boots Of Avoidance (the buried man quest).
Finally, if you can find BGI, complete the easter-egg quest for Big Metal Unit

That will boost your AC to -10

More than enough!
[ 10-23-2002, 09:04 AM: Message edited by: TaSSaDaR ]