User blog comment:Kogath/Monster Hunter Stories Discussion/@comment-26532315-20160909200308/@comment-25275196-20160914221856

@TNB12

Two things:

1. Khezu and Astalos are actually the only non-subspecies and non-frontier wyverns that use Thunder element. Fire element is much more overdone.

2. Chameleos came before Gigginox. Khezu also came before all of those thunder elemental monsters you listed (except Kirin, which came at the same time).