Good question! I like the idea of fallen Templars bearing witness to the Marshal's vengeance, and it fits the righteous theme of redressing wrongs and paying his debts. Fluff to follow!
Excellent work on Marshal Luther. Whose skulls are in the reliquary mounted atop his Terminator armor? Vanquished foes, displayed as evidence of the Marshal's martial prowess? Fallen Templars, there skulls borne in battle so their spirits may bear witness as the Marshal avenges them? Imperial saints whose consecrated remains grant the Marshal a measure of protection from witchcraft and Daemonic influence?
Marshal Luther bears upon the carapace of his Terminator armor a reliquary housing the remains of Marshal Elendil and Emperor's Champion Isildur, who gave their lives to banish the Daemon Prince "Sauron" and save the planet Numenor during the Second Black Crusade of Abaddon the Despoiler. Superstitious locals subsequently enshrined the fallen Templars' skulls and honored them as Imperial saints, though the Ecclesiarchy never considered Elendil and Isildur for sainthood. When Numenor was evacuated in anticipation of the 12th Black Crusade- during which Sauron returned to lead a Black Legion warband, and subjected the planet to Exterminatus- the refugees bore the bones of the "Saints Templar" with them, eventually passing the reliquary on to Marshal Luther.
Elendil and Isildur's remains still burn with the hatred the martyred Templars bore in life, towards the Warp and all it touched; when Chaplains submerged the bones in holy water to cleanse them, the water boiled; when the bones were polished with holy oil, the oil ignited, but left on the bones a golden sheen instead of blackened soot. In bearing the reliquary, the wearer of the Terminator armor gains a measure of protection from witchcraft, as the martyred Templars' spirits shield the one fighting to avenge them.
In-game special rule: Marshal Luther has a 5+ Invulnerable Save against enemy psychic attacks. In addition, if an enemy model targets the Marshal with a psychic attack and rolls a 1 in the subsequent To Hit roll, that model will lose one Wound as the martyrs' spirits retaliate against the "cowardly witch."
Thought to write my own fluff for the bones on Marshal Luther's Terminator armor. Hope you like it.
Edited by Bjorn Firewalker, 07 June 2020 - 08:41 PM.