Potion of Tangible Emotions (3.5e Equipment)
From D&D Wiki
Once the potion is consumed the user does not recognize any difference at that moment. Yet later during combat or moments of extreme emotion the user makes a will save of 13DC or is slain. If the user survives then he notices at moments of anger he can lash out with his with what looks like transparent red energy. The angrier the character gets the more energy there is. The potion also acts as an amplifier for emotions and once the character gets angry he must make a DC17 will save to calm down. Once the character realizes he has this ability he has creative control for example he can use the energy to grapple people from afar or use it to surround himself and attack from close. The Dm sees fit how much damage is done on how angry the character is.