Raising Avatar Attributes
From Solium Infernum Wiki
During the game, you can raise your Avatar's basic attributes by spending resources, or by performing rituals.
The below image shows the cost of raising your Avatar's attributes by spending resources. You can spend resources to increase an attribute from 1 to 6. Note that even though the cost for raising attributes to level 7 is shown, you currently can't spend resources to raise your attributes to 7.