Omniverbum

The Omniverbum was the term used for the longest word in existence, considered to be infinitely long, and possibly still being spoken. It was believed to have been the first word after Event One, coming out of the birthcries of the universe, when space was still small and sound could travel.

The Ish was an affix to the Omniverbum. As it was sentient, it is possible the whole word was sentient. It is also possible that, as the Ish was found on Xenocubis, the Omniverbum either existed partly there or was worshipped there by the people who believed the universe and everything in it were echoes of Event One. (BFA: ...ish)