This particular unit is a miniboss; it can regain HP by using cannibalize, use frenzy + shockwave, and devour enemies. Depending on different factors it can explode in three ways upon death; thus dealing either pierce (bones), magical (rot), or siege (explode) damage to all units around it.
If I can work around the arrays correctly, I might be able to use the explosion ability triggers with the regular non-hero abominations ingame as a sort of late-game Tech-Upgrade.
If you're wondering wth is this, is a warcraft 3-ambienced starcraft campaign, project. In this case, the prelude campaign Loomings (Miasmas) - Strongarm (Blackguard).