Choas has returned to the lands of Equestria.
In a unseen change of heart, Discord has returned to his Throne of Chaos, spreading madness and nonsense across Equestria.
After months of barely holding out against Discords' malevolent intentions, Celestia decides to pull a Last Measure Fail-Safe: A spell called Summoning of the Giants. After what seemed like a failure to even cast the spell, Celestia has given up all hope of seeing her home return to normal.
What she didn't know, is that her spell wasn't a failure.
It succeed.