After Eight Hundred Years of Collecting Bones from Another World, I Became a World Taboo

A bone rod plus a bone rod becomes a first-level skeleton, and a first-level skeleton plus another first-level skeleton becomes a second-level skeleton soldier... Han Feng looked at the altar in front of him and silently threw the dragon bone next to it. A loud noise came from the altar. Han Feng looked at the huge bone dragon with its mouth full of salivation and fell into deep thought.