The first iteration of the creature continues to be current within the novelisation of the Rise of the Skywalker e book.
Its introduction reads: “An enormous emerged, a hairless creature sheening with wetness, bits of lake detritus clinging to its pasty pores and skin. Its eyes have been squeezed shut, nevertheless it may nonetheless see after a style, as a result of draped over its large bald head and throughout one shoulder was a second creature with lengthy spidery tentacles.
“The two have been locked in symbiosis. Kylo sensed the enormous’s ache, as if it have been a slave to the spidery being that clung to it. Yet neither may it survive alone.”
Some idea artwork of Kylo assembly the creature was even created, which could be seen under.