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Tried Destrocray on monsters of the Edge, Rykros, Vahal Fort, Weapon Plant, Acacia, Shadmirage and the wild Sandworm. It's strange, could it be a dummy skill. or non finished thing like the spiral slasher? I don't know. It's name suggest it should be used by a powerful enemy but I tested almost all of them, including bosses and didn't work.
It being a combo skill could explain why it doesn't work... but you can make a lonely enemy do a combo skill. For example, a xe a thoul casting thunderblast.