http://dom3.servegame.com/wiki/Vastness
Ok.. Hypothetically...
So my favorite nemesis, Bob the vastness, is paralyzed and surrounded by 100+ undead and misc others most with antimagic (negate blood vengance a bit?), mistform, strength of giants and weapons of sharpness (should negate etherealness???). Anyway, they beat on Bob (paralyzed, defense 0, protection 0, fatigue 90,lucky, ethereal, blood vengance +2, MR 24) for many many rounds dying from blood vengence from the score but barely scratching Bob. You'd think one lucky hit per round at least would bypass BV and luck and chop off a big chunk of otherworldy ooze... but no.
the other odd thing is Bob Paralyzes quite easly but shugs off dozens of enslaves like water. I do have the 5MB -ddd debug. Reads like beatnik poetry..
-- so hits from phantasmal wolves easily miss due to MR
hitloc Phantasmal Wolf strikes Vastness wl0 diff4 -> 4
hitunit 25 14852 dmg0 spec4097 ba4
spec_mr pen 12 mr 24 (unr 25 vic 14852 dmg 2 eff 0)
resisted
--- but the other normal attacks can't get through the BV even with decent MR on the attacker.. odd no MR check for BV that I can see
hitloc Iron Corpse strikes Vastness wl1 diff4 -> 4
hitunit 1085 14852 dmg5 spec2097217 ba4
damage shift negated 21 pnts of dmg
hitunit 14852 1085 dmg21 spec128 ba4
damage 24 on Iron Corpse, spec0x80 ba4
Mistform negated 23 pnts of dmg
Mistform expired (dmg 24)
1085 striking with weapon Short Sword. att28 def-1
hitloc Iron Corpse strikes Vastness wl1 diff4 -> 4
hitunit 1085 14852 dmg5 spec2097217 ba4
damage shift negated 18 pnts of dmg
Does BV work off the defender's MR? That might answer some things. In any event, hats off to Robert the Vastness

!
-ssj