Talk:Discord/@comment-108.204.46.86-20120608064603/@comment-26973802-20120628181916

They did incinerate the Windigoes in Hearth's Warming Eve (although it is implied that there is at least still one around), and they could always find a new weapon to give Discord a family-friendly disintegration (maybe even Chrysalis as well, or maybe she'll do the disintegrating). Which could even pale in comparison to Discord's writhing in agony when he turns to stone.

Or Celestia could just stomp him with her hooves after he gets turned to stone like Nightmare Moon does to the Elements, and I'd say that's what she did (offscreen) if it wasn't strongly hinted that he'd return in Season 3 (she probably imprisoned the stone Discord in the moon, until a certain changeling gets him out)