I find that Skull Clan Hunter's (SCH) sneak attack vs undead does not work properly all the time. For example, I may be fighting 4 skeleton mages. After knockdown, I was able to deal positive energy damage to perhaps 1 of the 4 skeleton mages and the rest would read "immune to sneak attack". Quite often, even fighting against the same type of undead in the same battle, I find that my sneak attack would fail perhaps 90% of the time. Please advise.
Thank you in advanced.