To defend what's left of Camelot, King Arthur seeks an alliance with the good trolls living in Dwoza, and Claire tries to reunite with her lover, Jim Lake. Meanwhile, AAARRRGGHH and Blinky's friendship begins, Morgana Le Fay gives Gunmar his mind-controlling Decimaar Blade, and Douxie and Merlin finish building the Trollhunter's amulet, with Merlin promoting Douxie to the rank of Master Wizard with his own staff andwatching as it chooses Callista to be its first wearer. The trolls reject Callista at first and they refuse to join in the battle. however, the battle for Killahead bridge begins regardless. In part 1's end tag scene, Callista reads a rock with troll writing, translated "Deya." Accepting her new role, she renames herself Deya the Deliverer and sets the stage for the original Trollhunters timeline.
In part 2, despite our heroes' best efforts, Lancelot and King Arthur are killed by Bular and Bellroc in the battle for Killahead Bridge just after the Arcane Order decide to make themselves known and partake in the mass carnage. But just as all seems lost for the humans, Deya leads the trolls into battle to aid the humans. When Deya and Gunmar are at the bridge, she places the amulet on the side of the large construct, which opens the portal into the Darklands causing Gunmar and the Gumm-Gumms to be sucked into the darklands. At the same time, Claire and Douxie succeed in banishing Morgana to the Shadow Realm, with Claire foreshadowing their next and last encounter in the future.