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'''Grimskull''' was an [[Ork]] [[Warboss]] who led an Ork invasion on [[Forge World]] [[Graia]] in [[Segmentum Tempestus]]. Grimskull planned on looting the planet. However, after seeing what the [[space marines]] were after. Boss Grimskull decided he wanted it too. A device Grimskull called "the sparky thing". Boss Grimskull was killed during the invasion by Captain [[Titus]] of the [[Ultramarines]].¹