When you kill a certain number of a certain enemy, the monster will drop a special token that automatically goes to you.
The effects go like this
3*-Damage bonus vs --- :low
4*-Damage bonus vs --- :med
5*-Damage bonus vs--- :high
Kills required:
*3-25,000
*4-2,000,000
*5-15,000,000
Names:
Beast - Chroma Carnage
Fiend - Devil's Demise
Construct - Recycled Rubble
Undead - *post your ideas*
Slime - *post your ideas*
Gremlin - *post your ideas*
So basically, UVs, but in trinket form.
It could go somewhere? Your suggestion seems REALLY grindy, which is not good for a game that calls itself "grind-free." Maybe make these trinkets purchasable from Brinks with the preexistin' tokens, since they already do cover all six monster families. One line of trinkets per family, of course.
-Forge Sparks: Constructs and Gremlins.
-Primal Sparks: Beasts and Jelly.
-Grim Spark: Fiends and Undead.