MA T'ien Ch'i - a little of this, a little of that and BAM!

[cleveland]

Evo 1 gets you Geyser, which every Imperial Alchemist can cast. It's AOE 1, and ignores the etherealness, and at 6 damage is going to be pretty effective vs. those 9hp vestals.

Evo 1 also gets you Cold Bolt & Cold Blast, which every Celestial Master can cast. Since Vestals aren't cold immune, these spells (Blast = AOE 1, Bolt = Range 45 w/ Prec 8) are one-hit knockouts for those vestals.

Hope that helps.