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During battle, after a Demigryph Knight dies, the entity becomes an immovable obstacle for living entities. I noticed when i played the campaign as Ogre Kingdoms as bigger entities, like the Stonehorn, are basically immovable when surrounded by a few dead Demigryphs. Unlike when alive, they do not get pushed away by more massive entities. The same applies to the halberd variant. I am not using any mods, so I could not confirm this to be campaign exclusive.