Yarnball

 is Jester's moorbounder. As an NPC, is played by Matthew Mercer.

Appearance
A younger and somewhat "special" moorbounder, Yarnball seems interested in food and little else. Its eyes blink at irregular intervals.

Personality
Bloodthirsty, violent and extremely aggressive as one might expect of an apex predator, although it is somewhat gentler in its interactions with Jester, with whom it has has formed a strong bond.