I never really paid much attention to uncommon races but seeing the Sleep Venom feat has me very interested in performing some manner of cheese with the Vishkanya.
Benefit: As a swift action, you may alter the effects of your venom so the target falls unconscious. This changes the initial and secondary effect of your venom to the following: initial effect staggered for 1d4 rounds; secondary effect unconsciousness for 1 minute. You must make the decision to alter your venom before you apply it to a weapon.
Normal: Vishkanya venom deals Dexterity damage.
The key figure here is I am not interested in "poison" as a general term, but specifically the Vishkanya sleep venom, and to best utilize it. The imagery of tapping the BBEG, staggering him for a lucky 1d4 roll of 1, and then promptly having them fall unconscious is something that sounds hilarious, and particularly fun.
So how appears to be the best means of going about this? Would Alchemist's Sticky Poison count for Vishkanya poison?