Concôrdat, Greatsword of Bael Turath

Concôrdat is a greatsword of blackened, abyssal steel. Its hilt is fashioned of obsidian, magically hardened with a blood red ruby set into the pommel. Fiendish runes and sigils run the length of the ebony metal, detailing its pact in High Infernal. The blade seems to subtly smoke whenever it is within 100 feet of a demon or dragonborn, the runes and ruby faintly glowing in the eyes of those with darkvision. In the hands of any other than a tiefling, the grip sears the skin with a painful, but harmless, brand if used in combat.

Bael Turath

Millenia ago the great human civilization of Bael Turath was embroiled in a brutal war with their sworn enemies, the dragonborn of Arkhosia. Envious of the majesty and grandeur of the dragonborn civilization, the Turathian Empire connived to not only win the war, but to build the greatest civilization the world had ever witnessed. Under the leadership of their Mad Emperor, the noble houses and greatest merchants and artisans summoned the Devil King, Asmodeus. In a month long ritual of blood and sacrafice, the nobles swore their eternal allegiance to the Lord of the Nine Hells, infusing their bloodline with the strength of the fiends, beginning the true Tiefling race.

Asmodeus was as good as his word, and sent his devilish armies to rain hellfire upon the peoples of Arkhosia. He gifted those noble houses weapons and armor to help crush their enemies. To that Mad King who forged the great pact in blood, Asmodeus presented Concôrdat, a blade forged in hell to combat the demon horde, now etched with a new covenant: a sword to guide all tieflings and their decendents to earthly glory. Asmodeus, however, was surprised to learn that the Mad King was as devious as he was ambitious.

Under the very eyes of the devils administering the pact, the Mad King wove a clever clause into the contract: though all those who were making the compact were delivering themselves to the devils after their earthly life, all of their bloodline was entitled to the power of the devils without the stipulation that they owed them their souls. The Mad King had ensured his people power as eternal as hell itself, and the freedom to choose their own destiny. When the devils realized this treachary, they responded the only way they could: they unleashed such power in fulfilling their oath with the Turathians that the great warring civilizations were both reduced to ash and rubble, leaving any survivors as mere wanderers, fading memories of their mighty cultures.

Concôrdat

Weapon, (+1 Greatsword) legendary, (requires attunement by a tiefling)

Concôrdat is a weapon of legacy with abilities that can be unlocked as its wielder completes certain tasks. Concôrdat has a minor legacy , a lesser legacy , and a greater legacy . The minor legacy must be completed before the lesser, and the lesser before the greater if the wielder is to unlock Concôrdat's full potential.

Minor Legacy

Concôrdat was gifted to lead the tiefling race against the dragonborn, and to help them steal the glory of their rivals. If Concôrdat is used to slay a dragonborn with a CR of 7 or higher, Concôrdat recognizes the user as one worthy of calling upon fiends for assistance. It allows its weilder to cast Spirit Guardians as a 3rd level spell once per long rest with Concôrdat the material component and as though the wielder were of an evil alignment, though he need not be.

Lesser Legacy

Forged in the fires of hell, Concôrdat is most at home in the inferno. If its weilder helps to destroy a fire Elemental of at least CR 6 in an encounter of at least CR 12, Concôrdat turns to a +2 greatsword and grants its wielder immunity to fire damage as long as it is on his person.

Greater Legacy

The Mad King's beguiling of the Devils made an indelible mark upon Concôrdat. If the weilder is able to likewise trick or destroy the machinations a devil of at least CR 17, Concôrdat becomes a +3 greatsword in his hands. He is also able to cast Spirit Guardians three times per long rest as a 3rd level spell, or once per long rest as a 4th level spell that does not require concentration for three rounds. He can now choose if the spell does radiant or necrotic damage.