Are Warlock's Shadow abilities Void-based or Death-based?

Ever since we learned about the Void Lords and Chronicles defined the cosmology of magic types, it seems to imply that all Shadow magic, whether cast by a Shadow Priest or a Warlock, is Void-based, but I can't help feeling like there ought to be some distinction based on how they are each portrayed in game and lore.

For one, many Void abilities seem to attack the mind and drive it towards insanity, affecting both the caster and the target, but we don't see Warlocks or their targets suffering from any of these effects from their shadow magic as far as I'm aware.

Shadowmages, although they might be of questionable status in canon, seem to also be an indication of a different kind of "shadow" magic separate from the Void, as once again we don't see the same eldritch and mind-altering effects from them.

Necromancers and Death Knights seem to use some powers that are virtually indistinguishable from the shadowy powers Warlocks use, and by all accounts they are using Death magic.

I think at the end of the day what's bugging me is the erasure of the sort of dark arts, scholarly shadow wizard archetype in favor of the eldritch, lovecraftian fanatic. The former doesn't feel compatible with Void magic as it is typically described and portrayed, but seems to fit right in using Death magic.

Bear in mind I'm not making any definite claims about the lore here, just speculating and slightly headcanoning for fun. What are your thoughts?