Ha! I am invincable, Prove me wrong!

[ruleslawyer]

Some clarifications:

A half-dragon troll will have 6d10 + Con base Hit Dice (6d8 troll, with each die raised one step from the half-dragon template), and be either ECL +(8+3=) 11 using the DMG, +(11+3=)14 using the FRCS errata, or +(11+4=)15 using the ECLs in Dragon 293.

IMHO, half-dragon is definitely worth +4 ECL. Trolls probably aren't quite worth +11, but are definitely a better buy than ECL +8 would indicate; I'd put trolls at ECL +9 to be fair. So IMC, this character would be a 13th-level character minimum. At these levels, you're talking about foes who can use disintegrate, destruction, forcecage, prismatic spray, or any number of means that will destroy or incapacitate this character. As others have pointed out, this character is simply hard to actually KILL, because it's difficult to do normal damage to him. A hold monster spell will take him out long enough for foes to remove his items, at which point someone probably will think to use an acid attack against him.

 

[Corwin]

Set him up against a Half celestial pyro lernian hydra. Now, that's invincible against everything except death magic

Funny you should mention that. I just finished creating a half-fiend kaiju* 12-headed lernaean pyrohydra for my next adventure. It's an ancient evil that lies dormant beneath a ring of volcanoes deep in the frozen North. A place called the Valley of Fire. (Your basic "Lost World" jungle type place.)

It's a frikin' CR 33! Each head needs a single 75 point hit to kill it, then it comes back as two new heads... Lots of cool kaiju abilities... Nasty stuff.

Luckily, the PCs don't have to fight it, it's more of a "force of nature" that has to be contended with. And hopefully, if all goes well, the plot will eventually evolve into allowing them to gain the aid of a kaiju frost worm to help deal with the problem.

I can't wait to see the looks on my players' faces when I describe this thing. It should be a jaw-dropper.

----------

*For those of you unaware, Kaiju is a template that can be found in Dragon #289. Basically it makes anything into a "Godzilla-style" monster of colossal size with cool powers.

 

[Kae'Yoss]

Another method for subduing the troll ocurred: Creeping Doom! All you need is a Drd13. Althought it only deals subdual damage, it's still 1000 (!) points of subdual damage. That should render that munchkin unconscious for 15 - 20 minutes - plenty of time to strip him of all magical items and either immerse him in acid, put him into a portable hole to let him suffocate, or force-feed him about 10 gallons of black lotus (or, if you're low on cash, some other, lesser poison): Even with his high fort save bonus, he'll eventually fail a save and then his constitution is on it's way down (especially since his fort save just got worse!).

 

[Al]

An amusing thought just struck me...

Suggest (as in the spell Suggestion) that he look into a Mirror of Opposition. Then you have two unkillable brutes beating each other unconscious, recovering and repeating.

And since they never need rest, sleep or eat, it's decades of guaranteed entertainment.

Slap a few Walls of Force around them and turn it into a spectator sport.