demon of Humanity possession

The character summons his contractor (Demon of Humanity: Ravigal) into his own as a vessel of power. Although it is a possession, it doesnt necessarily make the demon control the character. Instead the user develops Ravigal's reflexes, a quarter of his power, and a vague sense of his knowledge and Ravigal's advises. (during these 10 rounds the user can automatically roll a d6 without action or reaction use and if it lands on 1-4 you dodge automatically. athletic and aerobic rolls gain advantage, all attacks decrease hit roll by 4 but increase damage by 6. additionally all intelligence stats and skill get advantage) When the spell is over the character takes 10 damage and roll a d20 to see if you faint/sleep (anything above a 10 is considered fine).