Crit Dmg

The description says:

Crt. Damage
Increases P.Atk by (#) when a critical attack occurs. Also enhances damage to target during PvP.

Does this crit dmg SA increase the damage of attacks like Backstab and Deadly Blow? and if it does is it the SA that increases it or the enhance damage ability during pvp that increases it?

Isnt Backstab and deadly blow partly effected by patak. Inwhich case I would say both.

Well, it means, that if u crit u have a higher patk for that crit. For example, if 100patk would mean u do 100 damage and crit would mean damage x2 = 200 damage, with crit damage SA patk +50 u would do 300 damage (100+50*2), but u get the bonus patk just if u have a critical hit.

Enhanced damage during PvP comes with every A and S grade waepon SAs, what means that u do ever a bit more damage in PvP regardless if crit or not crit.

If the Sa increase ur skilldamage, i dont know. If u can crit with the skill, maybe yes, but just for the crits.

All the dagger damage skills always crit (when they land). So yes, it does effect it. Adds quite a bit of damage, too :)