Read somewhere that you kill X mobs you finally cap them out, was told some tome unlocks are gained this way but dunno.
i went back to the start of the dwarf zone and capped about 200+ squigs unfortunatly i didnt get much more than 16k exp.
which i can understand else the starting zone would be full of high levels
those squigs really do spawn quickly
i got a 1 pip trophy for 1000 dead high elves. so 3 pips could be abything from 3k to 100k or more. or less!
i dont know but its over 1000