Husks

Husks are objects with no elements but Void, leaving them completely useless. If a spell hits a Husk, it will absorb the spell, and become the elements that the spell was made out of.

Living Husks
Living Husks are the result of living beings with souls who have had their elements drained. Attempting to use magic on them will result in the Living Husk being filled with one element and, due to the Æther from soul, transforming into an elemental. If a necromancer can obtain a Living Husk, it can gain the power of an elemental on their side, which can make them incredibly powerful if they can control them.