How to pronounce "therian"

In my head, I say th-ear-ee-an

Out loud I either pronounce it that way or th-air-ee-an.

The first I how I originally pronounced it but the second came from how I heard other people say it sometimes

I've always pronounced it as "there-ian," though my boyfriend pronounces it like "theory-in."

I am Brazilian, and my first contact with Alterhumanity was through texts, not videos, so I didn't initially have contact with the English pronunciation. Therefore, I pronounce it in a Brazilianized way of the word, "TE-RI-ÂM", which in English should be "TE-RHE-OM"
((I don't know how to spell pronunciation, sorry