A couple of tests:
Deep Seer casting Arcane Bolt at a Vastness does get harmed and eventually killed when failing the blood vengeance roll.
Also tested a soulless commander with brimstone boots (FR 100) and O'al Kan's sceptre (cast fireball) against a vastness. Same result: on failed MR roll the soulless was slain.
So unless there was a flaw with my tests it seems that regardless of whether the caster is immune to the damage type they will be harmed on a failed roll.
Might also be worth searching the forums as this topic seems familiar. Perhaps someone else ran more extensive tests.
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