Beast Serum

Potion, rare
  Doctor Jake Kill advertises his proprietary blend of bull’s pituitary and caffeine as a “sure fire way to lose friends and alienate people. Especially if those people are a swarm of marauding goblins”. Oddly enough he seems more than a little keen to get rid of this particular concoction…
  Tied up in a protective claw is a philter of bubbling red liquid. Upon consuming this potion, you are filled with a sense of rage and selfishness as your muscles inflate, and your veins bulge. For the next 10 minutes, you turn into a brute, the physical and mental manifestation of your most evil and selfish thoughts. You undergo the following changes for the duration of the potion’s effects:
  • Your size increases by one category and your weight increases by a factor of 8.
  • You have advantage on Strength checks and saving throws.
  • Your Strength score increases to 2 , if not already higher.
  • Your alignment changes to evil; you think of your own survival first and any trace of compassion or mercy is shredded.
  After 10 minutes elapses you return to normal and gain a level of exhaustion.
  Very rare variant, Bone Marrow Bouillon: add the following effects to the potion:
  • You gain 2d6 temporary hit points at the beginning of each of your turns.
  • When you would be reduced to 0 hit points, you are instead reduced to 1 hit point and fail a death saving throw. If you fail three death saving throws, you die.
  GM Tip: Whispers
  Tell your player about the change in alignment as a whisper, and explain it makes them feel selfish and angry so they can roleplay accordingly.