Bolas

[Pi]

Sit down son, its story time. (This can ask be found on the wizard's fiction section, uncharted realms)
The eldrazi were in the blind eternities, eating worlds at their leisure. Ugin worked with Nahiri, self-entitled guardian of Zendikar, and Sorin Markov, the seal away the eldrazi titans in a physical form. Nahiri made the hedrons all over Zendikar, and Ugin set the magic runes on them to trap the eldrazi.
Everything was going well for 3,000 years (or similar, you're welcome to check the exact number), until Bolas hatched a plan to release them. He made sure that Chandra found the Dragon Scroll, which revealed the location of the Eye of Ugin, the magical center of the hedrons. Jace, from his position in the infinite consortium, found out about Chandra having the scroll, and hunted her down. Sarkan Val, had been hearing the voice of Ugin in his head, ever since he left Tarkir. In his quest for a dragon to follow/obey, he planeswalked to grixis, and found Nicol Bolas. Bolas believes that Sarkan is insane, and sent him to the Eye of Ugin.
When Chandra made it to the Eye, she found Sarkan, in dragon form, and promptly began fighting with him. Jace intervened, and the power of the 3 planeswalker sparks, undid the work of Ugin, Sorin, and Nahiri, releasing the eldrazi.
Which brings us the Khans of Tarkir. Sorin has come back, looking for Ugin, only to find his bones. Sarkan has returned to his home world.

Whoa! Never thought of that way. So you're saying that KTK takes place before the  Eldrazi were released back into the multiverse?

"When Chandra made it to the Eye, she found Sarkan, in dragon form, and promptly began fighting with him. Jace intervened, and the power of the 3 planeswalker sparks, undid the work of Ugin, Sorin, and Nahiri, releasing the eldrazi. "

No the Eldrazi are currently at large still on zendikar

Tl;DR version: Ugin, Nahiri, and Sorin seal the eldrazi titans in Zendikar. Bolas manipulates Chandra, Jace, and Sarkan into releasing the eldrazi titans. Sorin needs Ugin ( it is implied that Nahiri is still on Zendikar) to seal them away again.

[The1337Magician]

Sit down son, its story time. (This can ask be found on the wizard's fiction section, uncharted realms)
The eldrazi were in the blind eternities, eating worlds at their leisure. Ugin worked with Nahiri, self-entitled guardian of Zendikar, and Sorin Markov, the seal away the eldrazi titans in a physical form. Nahiri made the hedrons all over Zendikar, and Ugin set the magic runes on them to trap the eldrazi.
Everything was going well for 3,000 years (or similar, you're welcome to check the exact number), until Bolas hatched a plan to release them. He made sure that Chandra found the Dragon Scroll, which revealed the location of the Eye of Ugin, the magical center of the hedrons. Jace, from his position in the infinite consortium, found out about Chandra having the scroll, and hunted her down. Sarkan Val, had been hearing the voice of Ugin in his head, ever since he left Tarkir. In his quest for a dragon to follow/obey, he planeswalked to grixis, and found Nicol Bolas. Bolas believes that Sarkan is insane, and sent him to the Eye of Ugin.
When Chandra made it to the Eye, she found Sarkan, in dragon form, and promptly began fighting with him. Jace intervened, and the power of the 3 planeswalker sparks, undid the work of Ugin, Sorin, and Nahiri, releasing the eldrazi.
Which brings us the Khans of Tarkir. Sorin has come back, looking for Ugin, only to find his bones. Sarkan has returned to his home world.

Whoa! Never thought of that way. So you're saying that KTK takes place before the  Eldrazi were released back into the multiverse?

"When Chandra made it to the Eye, she found Sarkan, in dragon form, and promptly began fighting with him. Jace intervened, and the power of the 3 planeswalker sparks, undid the work of Ugin, Sorin, and Nahiri, releasing the eldrazi. "

No the Eldrazi are currently at large still on zendikar

Tl;DR version: Ugin, Nahiri, and Sorin seal the eldrazi titans in Zendikar. Bolas manipulates Chandra, Jace, and Sarkan into releasing the eldrazi titans. Sorin needs Ugin ( it is implied that Nahiri is still on Zendikar) to seal them away again.

TL;DR: Planeswalkers are cool. Things happen. You really should read it all.

[Phoenix X30]

Isn't the lithamancer dead too? Planeswalkers live a long time but they're not immortal. Sorrin is still only about because he's a vampire.

[The1337Magician]

Isn't the lithamancer dead too? Planeswalkers live a long time but they're not immortal. Sorrin is still only about because he's a vampire.

Well, I think that he also was a pre-mending Planeswalker. Did all this happen before the mending, if so Nahiri might be alive too.

[MacheteMable]

The eldrazi also aren't all on zendikar. Only kozilek remains I believe, might be Ulamog. The other two titans have left looking for more plane nom noms.

[Spikepit]

The eldrazi also aren't all on zendikar. Only kozilek remains I believe, might be Ulamog. The other two titans have left looking for more plane nom noms.

Where did it say that?! Know of a link?

[Distriimuir]

The eldrazi also aren't all on zendikar. Only kozilek remains I believe, might be Ulamog. The other two titans have left looking for more plane nom noms.

Where did it say that?! Know of a link?

It was in one of wizards sites "novels" that they write randomly. Someone was on zenkidar and noticed it was almost completely destroyed. Offspring are still there but it mentions the Titans have left the plane.

[MuggyWuggy]

So if we go back in time....do we get mana burn back?