[Miller]

I'm fine with Volcanic being guaranteed on crit; it's a heavily underused enchant that rarely sees use outside of Volcanic Quickdraws which do an absurd amount of damage against any targets without a substantial amount of critical evade. That said, I don't think it's a good idea to give the average Quickdraw user around 96 ~ 112 unresistable damage per volley in an AoE around the target (assuming Dragon Remains and all crit + the change to the clause goes through); so having it proc a maximum of 3 times (48 damage on a DR quickdraw) per attack instance should be fine.

As for passives so this enchant can be more appealing to use outside of a gimmick, I don't think any of the current samples are a good idea. Fire ATK would just make the enchant more suited for mages that specifically want to ramp their Fire ATK up to a significant degree for Dynamic Tomes and fire magic in general. My personal suggestion is to give it a crit boost much like Vorpal but to a lesser degree to help the consistency of the enchant, +5 crit should be fine if this would be the case.

Volcanic is a neat enchant and I'd like to see it become more usable rather than something exclusive to multi-round weapons.