Generally speaking, a person weighing about 120 kilograms has roughly 4-5 liters of blood. Losing more than a third could be dangerous, and losing more than half could be fatal. So, how much is a mouthful of blood? Let's put it this way: hold a mouthful of saliva, feel the limit as you're about to burst, then spit it out and see how little it actually is... Even if you spat like that ten times, it might not even amount to the volume of one urination, and the usual urine output for an adult in 24 hours is only around 1.5 liters.
This Corpse Fiend, being tall and sturdy, and not of ordinary people, found that sacrificing a bit of blood right now, although impactful, was certainly not fatal.
A moment passed, and as he cast his spell, the surroundings began to tremble. The extremely "real" Red Mountain Melt River suddenly became like a lagging video, falling apart like stacked puzzle pieces amidst the high-frequency shaking.
