Kokkinos

This boon, bestowed upon a user by an outer-world's celestial being, grants the user immense power and physical capability. However, in addition to this power comes mental and psychotic drawbacks, this spirit requires the mortality of another to keep it tame, in the event that the user fails to kill something that has a life force (So things like constructs don't count) they will start to lose sanity and the Kokkinos takes control, sending it into Kokkinos Frenitida.

Kokkinos Streams define how many abilities can be used at once, this is equal to the amount of Streams one has, which is defined by level. (Any move that says "Teras" on it requires the Teras Stream and is only useable by the Teras.)

End of day 3: Wisdom Saving Throw DC = d20 roll from DM. Upon failure, take 1d10 psychic damage and take 1 point of exhaustion.

End of day 4: Costitution Saving Throw DC =  d20+4 (Advantage) from DM. Upon failure, take 2d8 necrotic damage and become poisoned.

End of day 5: DC 24 Wisdom Saving Throw + DC 24 Wisdom Saving Throw. Upon either failure, the DM takes control of the player character, all attacks deal bonus damage equal to that of the PC's proficiency difference.

Level 1-6: 1 Stream
Level 7-13: 2 Streams
Level 14-19: 3 Streams
Level 20: 4 Streams