Bloodline of Gremory

Proud, courteous and martially minded, Gremory little resembles his demonic brethren, but he is a demon nonetheless. His is the mastery of bladework, the training of the soldiers of Sheol, and diplomacy between the rivalling Demon Lords. He, and his Tieflings, take a mostly human form, with nary a demonic mark on them in most cases. He is also the Demon Lord most amicable to humans, dealing with them on equal ground and no seeming ill will. His spawn often embody these positive qualities and are vaunted as upstanding members of their respective societies. It is not for me to know if this is part of a grand plan to subvert reality, but I have heard rumours that Gremory has recently gone missing after his mission in Celotene. Demon Lords are a tough lot, but I worry a bit for his safety. I consider him to be one of the only positive influences in Sheol, and his absence could prove a danger to us all. 

-Chemardale, The Red Prince

Bloodline of Gremory:
ASI: +4 dex
Speed: 40
Keen Blade, Keen Mind: You can use the Bladesong feature from the Bladesinger Wizard subclass. In addition, you can add your intelligence modifier to your damage rolls on any melee weapon attack you make. 

Sword and Sorcery: You gain access to the -smite spells from the Paladin spell list at the same time a Paladin of equivalent level would gain access to them. You can cast each of these once per long rest.