This is an insectiod life-form within the [link] world setting.
The Line art is by myself, while the colour work is by

Archna: Found where ever one of the World Trees can be found, these are the only organisms that have been known to inhabit the great towering structures, living in symbiosis with the trees to provide protection from any predators that would be bold enough to prey on the imposing structures. The Archna are renowned for their flight speed and maneuverability, which is best utilized in their dive bombing attack strategies. These insectoid organisms possess the ability to store massive amounts of excess energy in small pellets of organic waste. Converting these pellets to explosive materials gives them their main form of defense against predators. During mating season, these insectoids take part in aerial dog fights around Yggdrasil, to acquire mates, however due to their relatively small size when compared to the tree, these violent competitions cause the tree to simply appear as if it is sparkling.