Iron Marauders

The Iron Marauders are a formation of the former 37th, 91st and 51st Grand battalions mixed together to be of the best specific use after all 3 grand Battalions suffered heavy loses during the Horus heresy, the Iron Marauders number in the thousands of traitor astartes with a large number being from other chapters/legions, they are led by the most senior Warsmith Tharrax who has 2 minor Warsmith under his command that act as his secondaries, Warsmith Tuross and Adonis of the 91st and 51st grand Battalions, the Iron Marauders also have a large number of Auxiliary forces that number in the hundreds of thousands.