The Urban Martial Artist's Path to Superpowers

An original fictional world, not fanfiction.

He transmigrates and is immediately treated like a snack. On the brink of death, he "eats" an alien beast's energy, right down to the last drop! Awakened to the one-of-a-kind "energy conversion" ability, he's a power bank for martial artists and an arsenal for ability users. In the apocalypse, survival depends on "sucking" up energy!