The Talent's CRIT Rate boost effect becomes stackable up to 3 time(s), and the Talent's duration increases by 1 turn(s). When Sunday uses Ultimate, can also apply the Talent's CRIT Rate boost effect to the target. When the Talent's CRIT Rate boost takes effect and the target's CRIT Rate exceeds 100%, every 1% of excess CRIT Rate increases CRIT DMG by 2%.
You don't need either. The LC honestly is a little meh, and Tribbie does not really do anymore than...