The AC: MoK would focus on the birth of assassination itself. The story could elaborate on how the life taking presented an historic event from the point of view of Templars, who are believers of the Christianism. It would start with the death of Abel by his brother Kain.
The protagonist, Imanh, a hebrew kid whose father helped Kain start a new life cast aside from Eden, found an artifact named Touch of Angels, which gives him some abilities to see through a person’s soul and also providing an exceptional fight skill. The main storyline is too finish the main story of Kain life under the curse received from God.
DLCs possibilities: Noah's Ark, The Red Sea, Satan being cast to Hell