One more thing, when I use Deadly Blow battle hangs, no options for next party member and can't end turn
Viewing post in Aric's Expansion Rebred
It appears that Deadly Blow is missing the effect field: "effect = null,". While I'm not entirely certain this is the cause, I am certain that if you were playing with the debug mod and used this ability then it would cause battle to soft-lock as the debug response to the missing field would be to abort the function and skip the part that manages the battle states.