My first idea was to create a pierce/bleed caster with player scaled pets. Blade spirits, living shadow devotion and sand devils from Azrakaa relic. Rancor fit the build idea perfectly, it ended up more of a caster/melee hybrid however. Build plays very well in my opinion and is fun to play.
Since Rancor is a faction weapon I included a budget version as well.
Trickster, Level 100 (GD 18.104.22.168) - Grim Dawn Build Calculator
Not playtested but looks really solid on paper.
Greens are for resists with some overcap > phys res, DA > % DMG.
of the Wolf is a great suffix for cunning builds.