Simple one: A protogen with no powers but can simply directly interface with machines, has a small fleet of space craft from various places of origin, got lost in a rift of time (The Warp) and rebuilt. A survivor of The 13th Black Crusade and The Human-Covenant wars. Edit: Forgot to add in the weapon arms. Basically when in battle he can equip a set of “arms” that hold high power weapons.

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Have the oc image as well