I like my spirit users of the non-Ternion variety.
Now that vitality damage scales with Int, you can really capitalize on Necrosis.
Get a Dreadful/Dire weapon of Nightmares/Devouring, a Legendary Fury's Heartblood, and some Legendary Vile Ichors; and at it all to the Vit damage Dream already brings to the table.
It is a good way to build an int-based, high damage, high survivability, melee pet-user.