IPA: /ˈɒmniɑːrk/
KK: /ˈɑmniˌɑrk/
A ruler or leader who has authority over the entire universe.
In the story, the omniarch commanded respect from all beings across the cosmos.
Omniarch is formed from "omni-" (meaning all) and "arch" (from Greek "archon", meaning ruler or leader). The word describes a ruler who has authority over all or is supreme in power.
Think of 'omni-' meaning all, and 'arch' meaning ruler — this helps you remember that an omniarch is a ruler over everything.