The striders have yet to be named by modern science. They are only known from scattered reports scrawled out by lost researchers that have drifted back to the seafloor. They are known to walk the surface world, perhaps on Ultra Deep Sea's equivalent of land. From these documents, it has been ascertained that the striders are fabulously tall, skinny, slow-moving beasts that spear their seagoing prey with long, harpoon-like tongues or tentacles. It is thought that the striders may feed on young Yolawis during the surface phase of their coming-of-age test, though other notes recall the strider recoiling in horror and pain once the Yolawis reaches its head, likely due to the effects of its psyfield, though the Yolawis dies shortly after in these accounts.
One note describes their calls as "the flutes of gods we cannot name". Another swears that the melodies are a language, still others insist that they sing legends and hymns of holy beings and saints that humanity has never met, and that the authors could understand every tone's meaning. One particularly ominous letter stated that once they heard the song, they understood all things and would sacrifice themselves to the dimension's "lord of the Caldera and the vast acid pits", whatever this creature or its associated landmarks may be. So far, none of these researchers have returned to recount or document their experiences in anything other than ripped field notes. It is of utmost importance that the Divers and their successors and subordinates reach the surface of Ultra Deep Sea, catalogue these fantastic beasts, their typing, their diet, and their behavior, and above all else, return safely.