Alright, some more submissions.
Chiyudo #16 Venom Scale 250 Kidou
Effect: Any poison in the patient's body will stop spreading. Any effects delivered by the poison will weaken by 50%. The effect of this spell will last for fifteen minuts of calm or three rounds of battle at max; it can be easily broken by administering the same or any other poison once again.
How: The user extends his arm and says the incantation, his reiatsu concentrates around the wrist, visually turning into a green-colored snake, waiting to be used. Even a slightest touch of the hand to the body of the other person will make the energy snake venture into the target's body, delivering the effects.
Incantation: "Seprents of Death - you who sleep in our grasp, you who dream of abyss. Open your eyes and bite. Chiyudo #13 Venom Scale"
Chiyudo #47 Black Gut 1400 Kidou
How: Caster places his hands upon the target's abdomen and recites the incantation.
Effect: All of the poison in target's body immediately rushes into the abdomen area and seeps through the skin right into the reiatsu orb in the caster's hands. This orb then may be dissolved at the caster's will; retaining the reiatsu orb costs 100 reiatsu for every minute.
The patient will still suffer from weakened(50% weaker) aftereffects of poison for five minutes of calm or 2 turns of battle.
Incantation: "Honor is white, red of the blood, black is corruption. Open your hara and show the purity. Chiyudo #47 Black Gut."
About Clear mind - increased cost and one turn of immunity instead of three.
Chiyudo #49 Clear Mind 1500 Kidou
Use for: When one is bound by illusions and/or effects that hinder their senses, this spell will help cleanse their mind and regain concentration.
How: The caster puts his palm at the target's forehead and chants the incantation. Immediatey the target is broken free from any mind-affecting effects and gains a one-turn-long immunity to those.
Incantation: "It seems to be real, not illusion, every word of truth brings confusion. Blind are your eyes, stolen are your dreams. See the light, be free from the nightmares! Chiyudo #49 Clear Mind."