Black Blood star sickness

For reasons shrouded in mystery to you, Black Blood Star Sickness has been inflicted to you. It's probably an important reason, even if you can't recall

Every 2 levels, Roll a d20.

• nat 1: cough out black blood. You Lose Control. 
• 2-8: you cough out black blood. Minus hp equivalent to the half of the roll.
• 9-14: you cough out black blood. nothing happens
• 15-19: you dont cough out black blood.
• nat 20: healing. 

Black blood:

Roll 1d10. Until the next battle:

• [1 to 3] You get a +1 spell dc, but in exchange for -1 AC 
• [6 to 8] for one spell, disadvantage for spell requiring rolls. but advantage for damage
• [9] For every combat turn until you summon "A Friend", Roll a d100. The DM will also roll a d100. If you roll higher, nothing happens. if the DM roll higher, you summon "A friend".
• FRIEND. everyone must roll a wisdom save. If enemies fail (DC19), they take necrotic damage of 6d8 (increases a die with each spell level). If Allies fail (DC10), they are Incapacitated for one turn. 
• you are Paralyzed for one turn
• [4, 5 or 10] nothing