ooooh . . . oops! my bad

Quiescence, abounding amongst the equable
as Heretofore, aural convention begets aura
humid, crisp, and thin all share The like
seek synonyms to calm the Tumult

my interpretation
(SPOILER)
calm, moving around those not easily irritated
so far, the tradition of sound makes a new aura
damp, crisp, and thin are shared properties
look for 2 words with similar meanings to calm the commotion

i've realised ive been trying to break it down without actually looking for an answer the first couple of lines makes me think of the yevonites. they appear very peaceful and their teaching are passed on by qord of mouth. not sure how the rest fits it though!?