Roks

Lizards who rode Wyverns opposed by the Castillar Frontier Legion (Ch. 52). Their skin is as durable and resilient as chainmail (Ch. 71) and is used as a sort of armour by noble officers in Castillar (Ch. 71). The Rok don't seem to mind this and some even lowkey respect the humans who wear clothes made out of Rok hide seeing it as a practical decision and a complement of sorts to the resilience of the Rok in comparison to humans.

Wyverns
The Wyvern Drones are based on regular Wyverns and so removing the Vex features they are huge bat-like creatures with a wingspan of over eighteen meters.