Look I only took a brief look at it but I assume it’s a Poison Cabalist
https://www.grimtools.com/calc/L2J8vrjZ
That’s what you should aim for. My setup is different cause I have MIs. Since you lack MIs I went more defensive in devotions and picked Master of Death over Possession. With MIs helping you out you should be able to get a standard setup
Badge of Mastery is +5 Doom Bolt
Boots can be crafted at any blacksmith provided you have the Blueprint
Hope that helped