Stormstrider

A stormstrider is a large creature that can be seen walking through highstorms.Book signing, Cumming, GA, 11/17/18 Such a creature does not move when a highstorm is not passing.Book signing, Cumming, GA, 11/17/18
There are names for such creatures in various parts of the lore about them; 'stormstrider' may or may not be just one such.Skyward release party, Orem, UT, 11/6/18
The two massive walkers that readers 'saw' during the storm that Kaladin and Shallan experienced, according to Brandon, were spren ... with the caveat that this may not have meant that they weren't Unmade, because such is not an either-or, so to speak.Legion release party, Orem, UT, 9/19/18
According to Brandon's beta-reader, Alice Arneson, the first-time, in-book chronology that readers 'see' supposed 'stormstriders' is in one of Dalinar's flashbacks from approximately 30 years prior.
Further, she's declared that it's likely that so-called 'stormstriders' and thunderclasts aren't the same thing.
==References==
Category:Fauna of Roshar