Hive Fleet Jormungandr
In 995.M41, the Legion would find itself defending the world of Megyre from Hive Fleet Jormungandr. Initially successful against swarms of advancing Termagaunts and Carnifexes, the Princeps of the Legio Annihilator had little chance to enjoy their victory. A new threat emerged, a gigantic Tyranid resembling a Trygon, but far larger. Similar in size to a Reaver Titan, its fangs dripped with acidic venom. Without effort the enormous Bio-Titan ripped a Warlord Titan to pieces and tore a ruinous path through the remaining war engines of the Legio Annihilator, using its superior maneuverability over the slower Imperial Titans to its advantage. Faced with this daunting foe, the Legio was unable to defend the world and the fate of Megyre was sealed. The status of the Legio since the battle is unknown.