Take yourself to Kurn's Tower and farm one of these:
http://wiki.project1999.com/Solist%27s_Icy_Wand (warning it's pretty rare)
Then when you're grouped you can just click it once a fight (with extremely good timing you shouldn't even miss a med tick) to always look like you're contributing while preserving your mana to save the day.
Also comes in handy if you don't carry weapons and get agro'd by a lvl 1 skeleton or some crap. Don't have to blow 80+ mana taking it out.