Hidden Stat Upgrades (Tree of Life spoiler)

[ganjatron]

Is there a list of items or actions that will raise stats beyond the usual ways - leveling up, clicking on shrines, etc?

I just noticed this the other day - when completing the Tree of Life quest, you get a plant bulb/seed that you need to plant in the Undead world. If you right-click this item, you have an option to eat part of the plant. Doing this gives you +1 intellect.

I know of the ring which gives you +3 int after 30 battles (and I think there may be other such equipment.) But is there anything else like this Tree of Life quest item? It is easily missed so I'm wondering about how many stats I've missed out on!