Just wondering, knowing that they have a class required umd, how well do grenades work, and more importantly, do items boost grenade damage at all (maybe a combustion item on a fire grenade). I'm assuming that wand and scroll mastery do nothing for grenades as well.

I know that the ultimate problem with grenades is that they can be evaded, but looking for a bit more viable DPS solutions for my spell singer bard considering that at level 18 he has over 40 UMD.

Thanks in advance!