a new vendor that sells tricks and you can only carry a couple of single use tricks into each level to kind of give you a bit of customization towards a play style
with stuff like
poppers - the little thrown firecrackers, distracts a wide range of characters to go check out and mill around the explosion site
smoke bomb - creates a short lived cloud that allows you to slip past enemies
sleep dart - knock out a single enemy for the round
spider webs - create a limited time slow zone to escape enemies
mystery cake - nearby enemies will visit the cake and increase their weight / slowness level for the round
etc