Leo cannot die; his body adapts to any damage or environmental threat.
Leo explains that the world is not a typical fantasy realm but rather Earth in the far future . He is not a human born in this era but a bio-engineered weapon created 3,000 years ago. Yuusha, Yamemasu Episode 6
This episode provides a massive "lore dump" that recontextualizes every previous event in the series. Leo cannot die; his body adapts to any
What the current world calls "magic" is actually a remnant of hyper-advanced nanotechnology and science from the 21st century. Leo cannot die