Quote Originally Posted by mouser9169 View Post
Well, I can see him multiclassing into some sort of Ancestral Weapon using class...
...Well, okay, I'll grant you that. Blanket statements are always bad; only Sith deal in absolutes.

Quote Originally Posted by Cazero View Post
Or Roy (finaly) remembers that he's pretty good at grappling and throw the giant overboard.
Grappling depends on size, strength, and base attack bonus. Xykon's size and base attack bonus are similar to Roy's at that time (if Roy was about 10th level, pure fighter, and Xykon a bit over 20th, pure sorcerer), and his strength is almost certainly lower. And there might be some circumstance bonuses involved. The frost giant's size is (of course) bigger, may have a higher Strength, and likely has comparable BAB.