Jace Beleren, a logical mage, and Ugin, an ancient dragon, are working together to find a way to defeat the Eldrazi; Gideon, a human who fights for justice and honor, is rounding up the survivors; Ob Nixilis, a demon who lost his powers as a Planeswalker, is trying to regain his abilities; Kiora, a merfolk native to Zendikar, is eager to use her new discoveries on other planes to help her home plane, and Nissa Revane, an elf from Zendikar, who lost her connection to the land and regains it in a surprisingly powerful manner.

[4] As the block's story line proceeds, Jace disagrees with Ugin on how to handle the rampage of Ulamog and his brood: Ugin advises against destroying the titan, Ulamog, as the ineffable nature of the Eldrazi means it is unclear if killing their physical form will destroy them entirely, or merely free them to roam across the Blind Eternities, devouring planes unchecked.

[6] Jace, Gideon and Nissa settle on a plan with the survivors of the army that retook Sea Gate to channel the natural leylines on Zendikar in tandem with the Hedrons to encircle Ulamog, trapping the Eldrazi again.

[8] Whilst Kiora leads a one-woman sea assault on Kozilek, Gideon, Jace and Nissa find themselves outflanked by Ob Nixilis.

The demon attempts to trap them on Zendikar to be destroyed by the Eldrazi, much as he himself was, but is stopped by the unexpected arrival of Chandra Nalaar, who frees them to continue the fight.

Kiora, the only planeswalker left to represent the Zendikari, is defeated by Kozilek and almost loses her prized possession, the Bident of Thassa which she obtained on Theros.

Jace lays out their battle plan: the corporeal forms of the Eldrazi, monstrous though they are, are only part of their existence; the rest of them reside in the Blind Eternities, the whirling chaos between planes.

Whilst Gideon, Kiora, Chandra, Tazri and the Zendikari army distract the Eldrazi with battle, Jace and Nissa are to use the remaining Hedrons to anchor them in corporeal form.

Zendikar quickly begins to struggle over the mouthful it has bitten off, and Nissa and Kiora, both Zendikari natives, almost come to blows over the fate of their home.