a robe that adds poision damage = sorcerer not Wizard because that adds scale armour, posion resist and a poison spit
a long sword that adds posion damage if the target is held i.e, web or tangle
a ring that heals you whatever you deal posion damage to the target
there are many options for hats, immune to crit or heal being two good options
another ring that adds posion to your weapon when ever you heal i.e, if someone/ thing heals you then whatever weapon you have is now a posion weapon
now as someone that also plays a posion build you will need a back up plan because a LOT of targets will ignore all this posion
