darkness is underused by a lot of non dks and thieves. even if the cleric has darkness and any tank has nv or thief, then the cleric can dark a room away and let the nv partner do the work while they hold a light for heals. and there's the moving through zones that see invis....and there's also the whole notion of fights where only 1 or 2 mobs see in the dark where a cleric can reduce a ton of self melee and blindly cast blinds against whoever is fighting them / harming them.... (see also thief/tank pairing)
it's a useful spell and probably one of the only non cures other than steelskin and animate a cleric might actually use while soloing ...which I realize sucks enough to where very few clerics choose to solo....but if they did....
