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[[File:Mk.XArmor.jpg|thumb|250px|[[Ultramarine]] Mark X Tacticus Armour]]

Mark X Tacticus armour is a suit that combines the most effective elements of ancestral [[Horus Heresy]] patterns of plate with more recent developments in power armour technology. The Mk.X was developed by [[Magos]] [[Belisarius Cawl]] at the same time as the Primaris Marines. These suits are currently carried into battle by [[Primaris Space Marines]] during the unfolding [[Indomitus Crusade]].{{Fn|7}}