The Immortal Ascension 1x23

The Bloon Cocoon under the Sky Concealing Bell ruptures. Tie Luo turns into a half-bull, half-humanoid demon. After the battle, Han Li discovers the Blood-Condensing Five Element Pill and a broken arm. Tie Luo, who's seriously wounded, escapes by burrowing a tunnel. However, Han Li has planted a tracking mark on him. Han Li intends to use it to locate their den.