I wonder how this works with skills as I often see pen or shred nodes but not sure if they are worthless when converted from the base damage.
The Drained Will node does not convert to poison shred no. It would have to specifically state it in the node description, which it doesn’t. However if you’re speccing into Spectral Putrescence, which many do, the poison stacks granted from this have an inherent poison shred, so that would alleviate the omission of the Drained Will node.
People typically convert Wandering Spirits to poison because of Spectral Putrescence, as it makes it easier to scale both the spirits and the poison damage from the darts with a single affix.