Need help killin a 18th level cleric or a 17th level monk.

[Plane Sailing]

Basically your only hope is if the monk or cleric is a moron. And to get that level they shouldn't be. They will be equally likely to be planning against all your eventualities and their resources dwarf yours. You count as a CR6 challenge (actually a bit higher because of your stats and stuff) and under any normal circumstances they should hardly break sweat to get you.

Cheers anyway.

 

[Utrecht]

Another Possible solution to the Cleric is poison use that targets his Wisdom (don't rememeber any, but do not have any of my books here)- if you can knock it low enough - bye bye high level spells.

Use your ring of the lance to garuntee you will go first and then poison poison and more poison.

 

[Emirikol]

Just crit him a few times.

 

[Darkness]

Just crit him a few times.

3 1/2 years? That's some serious thread necromancy.