A while ago, someone was running a PbP where you had to try and kill dispater.... personally, after thinking about it for a bit, i have a rough sketch of a character that might manage it. if anyone has any improvements or suggestions, or wants to post a dispater slayer idea of thier own, please do.
personally, i would have gone with a DR 18 diety called "the liberator" or something freedom based. goes swiftblade, takes argent savant, dips paladin of freedom, takes obtain familiar+wild cohort, and takes the "supermount" stacking feats. as for the mount, since it should have almost as many HD as you, takes spell stowaway(time stop), knockback and dire charge, and is a light warhose. a warblade dip for iron heart surge is required for this char to work.
in addition, the char grabs sun school, as does the mount, and does the following:
walk 5 feet into dis.
uses iron heart surge to shout a challenge to dispater. iron heart surge breaks the "no-teleport" and all the other dispater disables.
the char then either:
A) greater teleports, along with his mount, into dispater's jail and frees everyone, especially the shadow sun ninjas. uses diplomacy, and leads the assault on dispater with an army.
B) quickened greater teleport into dispater's chamber, along with mount, and has mount charge. at the end of the mounted charge, jumps off horse and casts a gate in mid-air, which leads to the chaotic good heaven, making the gate directly behind dispater. the horse then full attack knockbacks(or bull rushes) dispater through the gate, and you activate innervated speed. this is an (Ex) ability that functions akin to timestop, but dispater cannot use spell stowaway on it. you move through gate, disable dispater's ability for extradimensional travel, and start beating him up with the help of the celestial hordes. now, dispater will respawn in dis in about 90 years or something. during this time, you completely dismantle(har!) dis, and prepare an ambush of epic(har again!) proportions. hell (again, har!), you will probably at this point have the assistance of half the lower planes, who are trying to claim dis' domain(s)(heh, i did it again) for thier own. this completes the requirements of the challenge, which are to kill dispater in dis. nothing in the rules requires you to kill him is dis FIRST, so the twice-slaughter is quite a good workaround.
i think that the best way to kill dis, is to simply use unique abilities granted by obscure sources to bypass dis defences. swiftblade, i believe, is possibly the best ever made workaround for fighting dispater. just persist a swift haste in the begining of the day, and you gain extra actions and an (Ex) freedom of movement. you can even run across molten iron and lava, and you have time stop as an (Ex) ability that cannot be stowawayed.
any thoughts? did i forget something important?
and please, I would really like to see what others have thought of to beat the crap out of the iron lord
edit: keep in mind, kicking him into the heavens lowers his divine rating by two, and you can grant your familiar/mount/companion horse DR 0 to deal with most problems.