look at your journal, the library owner gave you a clue to the next(also i believe its the last one for this update) potion, then just look for the option to use it on a creature, wont tell you wich one tho >:D
I got 27/28 memories unlocked but i cant seen to find the last one, in the creatures menu it says Memory not discovered on the Rockbiter but when i find the creature there is no new option or locked option saying that i need any potions...(btw im not talking about the repeatable image, got that one).
