Here's some of the stuff a friend potion can do:
What does a friend potion do: when potion is thrown on enemy they follow you and protect you at all costs
How many enemies can you have with you: you can have up to 1 so it's not too overpowered( if you try to throw the potion on a different enemy, the previous one you had will attack)
(Just to clarify you cannot use it on any of the boss)
Let me know if you like or dislike it in any way, I love to hear your thoughts.