From: The Destoyer | #009
http://www.giantitp.com/comics/oots0652.html
http://www.giantitp.com/comics/oots0653.html
Xykon's most recent fight.
against dorukan in start of darkness, an other epic-level caster that's pretty similar in power to xykon, his strategy was to cast energy drain over and over. I don't know dnd stuff at all, so i don't know what the spell does exactly but xykon says "all I need to do is keep smacking you with Energy Drains, and soon you won't be able to cast any of your fancy spells at all."
So... seems like that'd be pretty good?
also, Xykon is immune to cold, electricity, and fire.
and xykon only dicks around against opponents when he knows he vastly stronger than them and has already won the fight. he kills npcs in droves without hesitation and he doesn't mess around at all the one or two times he's fought someone that's actually a threat (see: dorukan)
Doesn't work like that. Xykon has to land a hit to drain Harry. Landing hits isn't that easy against someone with excellent reflexes and good magical wards.
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Sburbopolis, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60981373