I can't find it anywhere, and I don't want to invest time/money unless I'm sure this is going to stack - What the heck bonus type does the Vistani core use for the multiplier? The tooltip states: You gain a +1 Competence bonus to Critical Threat Range and +1 to Critical Damage Multiplier with daggers and throwing daggers.
The threat range is very obviously competence, but the multiplier is ambiguous. Is it also competence?