There is a potion that takes one radom wound of the charter you use it on in the game i can't remmber what it is called of my head.

edit

Just checked it is called Iru Elixir it is a green bottle, in my single player game i relized i had them and was saveing them up then i finshed the game lol but i got at least 13 left in my invtory etc.

edit 2

If i am remmber right, not done the single player campagin for a while you get them throught quest's or can buy them at shops (towns) but i might be remmbering wrong hopfuly someone esle will be able to come on and confirm if i am remmebr right or not

Any way hope that helps at least

edit 3

Last one know lol just checked game again and can confirm the potion's are bought from a shop for 150 Glidar