This build looks to use the Weapon Set system to summon a Skeletal Brute, which is then consumed by Decompose from Corpsewade.
Minions have a respawn timer. With this tree, your minions will respawn in approximately 6 seconds. We use the Weapon Swap to save the Corpse to consume when needed.
When mapping, you can chain Poison from the mobs corpses you kill into the next pack. If you walk through an area that isn't dense/the poison runs out, weapon swap to summon the Brute, pop it, and swap back to your curse setup.
For bossing you just drop corpses, swap to Blasphemy set, run around, rinse and repeat. Drop 2 Dark Effigy for Wither stacks against bosses.
Vine Arrow was tested for bossing, but the performance was mediocre. Having a Temporal Chains setup with a Sceptre on Weapon Set 2 felt better. Without Attack Speed, Vine Arrow doesn't feel great. It also appears to only work on 1 Vine Arrow, so you can't Scattershot for multiple effectiveness.
Notes on Corpsewade / Decompose
The Decompose skill does scale higher with levels, but barely. The difference between level 19 and level 18 Decompose is only about a 1% increase in damage. It's not worthwhile to invest into Chaos levels any higher, but if it's free it's still nice to have.
Important: The Level Requirement of Corpsewade is not always the same. You can get one as early as level 11, but the item level / Decompose level will be low. Look for a Corpsewade that is high enough level for Level 18 Decompose. It's possible for level 19 to be dropped from Pinnacle Bosses, but the rarity/price to performance is not worthwhile.