Umbriel takes 10 on her CL check (using her Arcane Mastery feat) to get 29. Succeed or fail, she'll learn something interesting
Also, can you confirm my Contingency is okay? I basically want a Silence to go off (targeted on Umbriel) if the party is about to get hit with a Blasphemy/Holy Word/Word of Chaos/Dictum, or Wail of the Banshee. If possible, I'd also like to use my Extraordinary Spell Aim feat to exclude Umbriel from the effect of the spell, at the time that I cast it into the Contingency.