[Ironhawk]

Well, if the Wyrm is only taking a few troops with him at any time then the most cost efficient way to kill him would be to surround that army and force them to rout by killing those few men. Then the Wyrm would die in retreat w/o you ever having to fight it.

After that, there are plenty of spells which will kill an SC. One example is Soul Slay. Even if the Wyrms MR is good, enough massed soul slays will eventually get through. There are plenty of other spells in that category: Frozen Heart, Charm, Blindness, etc. Or if you want a way that doesnt check MR, you could use Gifts from Heaven, Incinerate, or even Farstrike or Star Fires (if you had enough of them). Additionally, casting Curse on a dangerous enemy SC is always good. If you wanted to use equipment you could always go with a Heart Finder sword, or equip a commander with an Eye Shield and send him to go get eaten. Additionally there are plenty of artifact weapons which would settle this dispute pretty quickly.