First Treachery

The First Treachery is a major event in the Legendaria. It is defined as when Tharizdun convinced the Primordials to attack the Gods, causing the Dawn War.

Story
As it goes, Tharizdun was corrupted by an ancient group of demons called the Obyriths. They twisted his mind and demanded he create a realm where they could unleash their full potential, the realm later known as the Abyss. They told him to plant it within the Astral Sea, but Tharizdun had his own goals, and instead began to form it in the Elemental Chaos, which he desired to control. In order to cover his operation, Tharizdun convinced the Primordials to act on their long-standing distaste for the Gods and invade the newly formed Prime Material Plane, the prize of the Gods. This would result in a massive conflict known as the Dawn War. With both sides distracted, Tharizdun took his time to form the Abyss undisturbed.

Eventually, when the Primordials lost the Dawn War, the Gods discovered Tharizdun's creation, and realized his plan. For his betrayal, the Gods commissioned Torog to form a prison to hold Tharizdun. Torog created a pocket realm called the Void, in which Tharizdun was chained and thrown into, never to be let out.

It is said that to this day, Tharizdun remains trapped in the Void, stewing in his madness until he can finally escape.