“I saw that the Host of Heaven was dark and rode no more in the sky. The icy gates of the land of the dead were opened and the fallen god rode forth with a crown of iron and a sword of flame. His raiment bled the blood of the innocent and he smote all the lands of the world. His form was of fire and shadow, and his name was Sorrow.” – Prophecies of the Last Age
There are no restriction on your selection of ability scores. Use the standard array as a base and use the point adjustment as detailed on page 16 of the PHB. You may alternatively select from the list on the next page.