As a bit of a side-suggestion...
How hard is it to make Fire / Acid / other varnishes? I don't think anyone will find an imbalance in them, and perhaps improving their power or frequency would make it more feasible for throwing on weapons in dungeons rather than reserving for extremely rare occasions.
I mean it's not like you can't make yourself happily immune to the elements, so PvP wise it should be a nonissue.