"Don't think for a moment that you have saved yourself," Yara says mockingly. The words were mostly for her own comfort, she had died a few too many times to truly become overconfident in battle. Quickly her mind snapped onto a solution to the sudden increase in power Vlarath displayed. As she has done many times before, she reaches out psionicly to sever the magic from her target.

Spoiler: Twinned Dispel
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So a targeted dispel is one check per active power/spell on the target. Lets assume he has at most 5 so I'll make 10 total rolls. If there are more, then I guess the dm should make the extra rolls.
Dispel 1:
(1d20+20)[36]
(1d20+20)[30]
(1d20+20)[26]
(1d20+20)[29]
(1d20+20)[28]

Dispel 2:
(1d20+20)[34]
(1d20+20)[29]
(1d20+20)[27]
(1d20+20)[25]
(1d20+20)[39]


On seeing the result, Yara follows up with up with either further dispels or karmic retribution.
Spoiler: Variable Choice:
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If Vlarath is sufficiently dispelled, Yara will do the following:
Spoiler: Twinned Quickened Disintegrate
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DC 21 Fortitude for both. Augmented for extra damage
Dis 1: (38d6)[133] or (5d6)[19] on save.
Dis 2: (38d6)[132] or (5d6)[17] on save.

Else if some dangerous looking effects remain, dispel again:
Spoiler: Twinned Quickened Dispel
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Dispel 1:
(1d20+20)[24]
(1d20+20)[32]
(1d20+20)[36]
(1d20+20)[33]
(1d20+20)[36]

Dispel 2:
(1d20+20)[30]
(1d20+20)[34]
(1d20+20)[21]
(1d20+20)[32]
(1d20+20)[25]