Fly around the cave collecting blood off the slimes that approach you, then return to the central altar to sacrifice the blood you have collected to Kali. Then you can use your own blood to fuel your crusade.
@ausstein I should have made that clearer, you lose one point of your own blood (the arm in the bottom left). I was way too tired to think about what I was doing when I uploaded.
When the timer runs down nothing notiacable happens is that supposed to be?