Any bonus cold damage is multiplied by 3-4 before it is added to this attack's damage.
Normally, only a single use of one of these skills is allowed per combat.
The 17 Cuts is the exception to this rule. The use of The 17 Cuts does not exclude the use of the other four skills, and vice versa. However, The 17 Cuts can not be used if the player has the Haiku State of Mind effect, so it also can not be used twice during the same combat.