If your Imamu is low on spirit or don't have any left, you can use shillings or soul shillings to rechage it!
(Imamu also gets spirit when it lvls but it goes a little slow)Press "n" to open the page of your imamu
Click the rechage button and then add the amount of shillings you wish to add!
1c shilling = 1 imamu spiritThen you press confirm and your done!