Magic Spring
From The Heroes of Might and Magic III wiki
A location where a hero can double his maximum spell points instantly.
If a hero has 5 spell points remaining out of a maximum 40 then the hero will instantly have 80 spell points. However, the effects are not permanent; you will have 80/40 spell points until you use them.
There are two drinking points on a Magic Spring. Each Magic Spring may be used only once in a week, but the two points function independently.
