I'm a bit confused by the potion / poison puzzle:
The skull in the room itself will give you 3 "poems" and the 2 skeletons on your way out to the mine give you two more. But... hovering your cursor over the potion bottles will get the skull to tell you the corresponding poem nonetheless? So I'm not entirely sure what this part is doing.
Viewing post in The Tomb of King Pervy (in development) comments
He repeats the poems after you have found them (or fatally drank them). For the ones you haven’t found he says something like ‘bottoms up’. This is so you don’t have to remember them.
Not all the clues are hidden in this release. If I remember correctly the four notes aren’t there yet. But the five clues you have are enough.