The slayer can focus his poison delivery to be especially deadly to his studied target.
When the slayer studies a target, he can immediately reduce the number of additional studied targets he can maintain. Reducing this number does not require an action. For each target reduced in this way, the DC of poisons used against his studied target increases by 1.
The slayer must be at least 6th level and have the poison use talent to select this talent.
Pathfinder Player Companion: Potions & Poisons © 2017, Paizo Inc.; Authors: Kate Baker, Eleanor Ferron, Nathan King, Lyz Liddell, Luis Loza, Alex Putnam, Alex Riggs, and David Schwartz.