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{{Spoiler|source=The Outcast Dead (Novel)}}

[[Image:Mk1power armor.JPG|thumb|right|Mk.I 'Thunder' pattern [[Power Armour]] ]]

The '''Thunder Warriors''' (also known as the '''Thunder Legion'''{{Fn|7}}) were the genetically-engineered warriors of [[Terra]] created by the [[Emperor of Mankind]] to [[Unification Wars|unite the homeworld of humanity]] beneath His rule in the 30th Millennium. They were gene-enhanced warriors created by the Emperor and served as the precursors to the present-day [[Space Marines]]. Wrought to be living weapons, the Thunder Warriors were known to be physically stronger, more savage and more potent in combat than the later Astartes, though they were not as long-lived.

Thunder Warriors were the elite super soldiers that marched with the [[Emperor]] to conquer [[Terra]] in the [[Wars of Unification]]. The engineering that the Emperor used to create the Thunder Warriors, whilst creating superior fighters, was not as efficient as what was used later to create the [[Space Marine]]s{{Fn|3}}, nor was the technology as advanced or the geneticists as entirely willing.{{Fn|5a}} These proto-Astartes were organized in twenty regiments of no more than a few hundred warriors, each named by the Emperor himself.{{Fn|4}}

===Appearance and Abilities===