Jellyfish are those amorphous, blobish type creatures that seem to float around in the ocean. Some, like the Portuguese Man of War, are actually made up of hundreds of thousand individual jellyfishes who come together and act as one creature.
This one only wishes to spread word of the Enkindlers and how they brought light to the cavern. Why is the other so reluctant to learn their wisdom? (virtual stale cookie crumb to whomever recognises the lame reference :P)