Era of the Aboleths

Summary
An era before time, this is the era before any recorded history. All knowledge of this era is second hand from the studies of the the wizard sage Zasheir Rein, who studied and even read the minds of some Aboleths.

Before Time
The Aboleths are all psychically linked and they all share memories. Because of this, their entire history is known by all of them at all times. Zasheir Rein psychically bonded with an Aboleth and learned all of their secrets from the dawn of their species, which was apparently even before the deities existed.

The Aboleths existed on many planes on numerous worlds and ruled them all. When they Gods came, everything changed. A war started between the Gods and the Aboleths.

War With The Gods
The Aboleths were not as powerful as the Gods, but they had every minion at their disposal. However, the Gods were nigh invincible and destroyed their minions or even turned them against the Aboleths.

Slowly but surely, their rule of the multiverse was crushed. They survived as a species, but they all remember that they used rule the multiverse.

Waiting...
The Aboleths still control various creatures and are still plotting. Their schemes to take back all the worlds are forming and slowly but surely building to their conclusion.

Signs of the Era
Aboleths are still in the oceans, manipulating things from below. Chuul were creatures made by the Aboleths to venture forth on land and do their bidding, and some of their kind remain.