Windstorm, a rarely-seen spell around GK, and a lovely gift from the lord of the skies, Leucetious.
This prayer used to do something - killed bomies instantly whereupon they respawned with a new image (no exp or no drop, it was just a weird bug that made them molt, and it always got a 'wtf' out of people). Now it just looks pretty. I'm sure there's other prayers/spells that need to be enabled/fixed/changed also.
I've loved windstorm ever since I cast it for the first time ever so long ago, and have been waiting patiently for it to actually do something (besides get a 'wtf' from people, which it still does quite well
Possibly have it throw players/monsters around a bit and do minimal damage?
Produce a secondary icestorm-like effect (the old one - rain) when cast over water?
Make fire spells more potent when cast on them? (hint: blacksmiths' bellows)
Another nice change would be if it finally showed up in the quickmenu for spells. *hint hint*
Just a few ideas.