Your ring has a number of charges. Charges are used to cast ring spells . If you have an identified magical ring , you have the ability to cast ring spells. With every ring you can cast all of the six ring spells. The selected ring spell is shown in the picture down left.
Every Ring has a certain amount of charges.
They are shown on the screen. Also on the screen is the casting cost for your selected ring spell. It may range from 1 to 6. That depends on the spell, the ring and your class. If you have too few charges left, you cannot cast the selected ring spell.