Soul Gratitude is a new mechanic implemented in the Better Save Soul DLC. It is used for Remote Craft Control (RCC), which allows you to survey an area through the map menu (after a certain point in Euric's quest is reached).
It is now possible to both observe and craft items remotely with the help of Soul Gratitude, a new type of "points" system obtained through the Soul healing mechanic. Remote Craft Control can only be used in areas with Soul Receivers, which have to be built in each area beforehand. There are 12 Soul Receivers in total.