Pet nerfs and changes.
Also the items used as core here can be used for this instead - Nocturne – Lazy, Budget, Player scaled Pets, Conjurer & Ritualist
So, I no longer recommend Hecate unless someone really wants to go for it.
Keep in mind that Pet Necromancer is still rather strong. It is just that on a budget, making one that can tackle endgame content is going to be hard. Eg - Skulls & Bones - Pet Ritualist