Secret Keeper

What does a Truthwatcher spren look like? Glys is designed to be somewhere in between Pattern and Wyndle, fitting the description of Ym's spren from the interlude chapter.

Quote

Something moved in the dimness to his right. Ym glanced in that direction, but didn’t change his posture. The spren had been coming more often lately—specks of light, like those from a piece of crystal suspended in a sunbeam. He did not know its type, as he had never seen one like it before.

It moved across the surface of the workbench, slinking closer. When it stopped, light crept upward from it, like small plants growing or climbing from their burrows. When it moved again, those withdrew.

Interlude 2, "Ym", Words of Radiance

For that matter, what does Renarin's toy thing look like?

Another picture of Renarin, this time wearing Shardplate: