The Omnitrix was created by Azmuth as a tool of peace in an act of repentance following the destruction caused by his previous creation, Ascalon, a weapon of terrible power.
The Omnitrix had a two-fold purpose:
- It would promote inter-species understanding by allowing other beings to experience different ways of life.
- It would serve as a repository for the DNA of over a million different intelligent species, preserving them in the event that any of them should ever become extinct and bring them back.
- Secretly, Azmuth had another reason for creating the Omnitrix: he hoped that his estranged lover Xennith, who had left him as he created Ascalon, would learn of his change and come back to him.
The Omnitrix was destroyed in The Final Battle: Part 2 in order to prevent Vilgax from using it.
Azmuth revealed in The Ultimate Enemy: Part 2 that he had started working on the third Omnitrix ever since Ben found this Omnitrix.