If Invisibility exempts one of several Undead or Byakhee, how many dice do the rest roll?

Question

Accepted Answer

Fewer. An invisible unit is not counted as present in the Battle, so the remaining Undead or Byakhee roll the dice their smaller count gives. Two Undead with one made invisible leave the other rolling zero dice. Formless Spawn still count every Spawn in play, so an invisible Spawn does not reduce the other Spawn's dice.

Cthulhu Wars

If Invisibility exempts one of several Undead or Byakhee, how many dice do the rest roll?