Dai Shi

Dai Shi is an ancient evil eight-headed Dragon who attempted for 10,000 years to rid world of the human race and believed that animals should be the rightful rulers, dealing with the Phantom Beasts when they tried to overthrow him. However, Dai Shi was defeated by the first Pai Zhua warriors that became the Masters, sealing his spirit inside a chest and guarded by generations of Pai Zhua members. However, thanks to Jarrod attacking Mao in anguish of being denied the task of guarding him, Dai Shi was released from the seal by accident, killing Mao before using Jarrod's body to revive his Rinshi and continue where he left off, starting the "Beast War" anew. But though he picked Jarrod for his impurities, his host still has a bit of control over his actions but is heavily influenced by him the same. However, Scorch noticed this when Dai Shi became their Phantom Beast King, his promoting of Camille and exiling of Whiger, deciding to do something about it.

After Grinder's death, when Scorch questioned Dai Shi's decision to promote Camille out respect in her power or out of care for her, Dai Shi realizes his hold over Jarrod is beginning to malfunction when he attempted to kill Scorch for questioning him. Eventually, Dai Shi regains total control, until Casey's interference managed to break the spirit's hold over Jarrod and is forced to leave his body before siphoning out both his Rinzin and Camille's. Now without a host, Dai Shi begin the final stages of his war and gather enough fear to resurrect his army. But once his revived army was destroyed, Dai Shi used the masters' animal spirits to restore his physical form - a large, golden multi-headed dragon monster - and was practically invincible. However when Jarrod attacked Dai Shi from the inside, the monster was weakened enough to finally be destroyed by the three chosen guardians: Casey, Theo, and Lily.