Kingdom of Heroes

Recapping from the previous episode, Clay hands The Book of Betrayal not because he was corrupted, but to exchange it for Jestro's freedom. Monstrox makes the deal and frees Jestro, but chains Clay in his place to take his body for his own. As part of the ritual, Monstrox regurgitates the evil spellbooks. Meanwhile, the other Knights follow Clay to the Book of Monsters' lair, but are overwhelmed by the Lava Monster Army and reluctantly follow Jestro through the death trap-filled backdoor entrance. Upon reaching Clay, the Book of Monsters nearly completes the ceremony, but Jestro and the Nexo Knights hold him off long enough for Robin to hand Clay Merlok and Techcaliber, which Clay feeds to Monstrox. Overwhelmed by Merlok 2.0's power, Monstrox explodes into energy, destroying his book body while curing Jestro of the Book of Evil's effects. Merlok 2.0 is presumably destroyed as well, but when Robin replaces Techcaliber's motherboard, Merlok 2.0 is revealed to have survived. With Jestro also having been forgiven for his actions and reinstated as court jester, the Nexo Knights celebrate their victory with the rest of the kingdom. When Jestro looks at the sky, he sees Monstrox's face implying the necromancer's survival as a spirit.

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S03E01 - The Cloud