Since Roman times, people have associated the hand's fourth digit with the wearing of rings. In many cultures, a proportionally longer ring finger in men has been taken as a sign of fertility.
The ball explodes on impact, knocking enemies to the ground and dealing 1d3+3 fire damage per two caster levels (a successful Reflex save reduces the fire damage by half and negates the knockdown effect) and 1d2+2 force damage per caster level (no save) to targets in the area.
Sevy. Both are good really, but i would give Plague fire advantage due to better effect in PvE and very decent in PvP it seems.. Perfect Vorpal: +50% critical severity. (Critical Severity increases damage done on critical hits.). Greater Plague Fire: +7.5% Fire damage.