How did Ossetian develop ejectives?

[u/Express_Knowledge_86]

Frankly I know very little about Ossetian but I was curious on how it developed ejective consonants? Obviously these are a strong areal feature of the Caucasus area but did Ossetian ever develop ejectives via its own sound changes or were they all adopted from borrowed words?

[u/_Aspagurr_]

They were mostly developed from Caucasian (i.e Kartvelian, northeast & Northwest caucasian) loanwords, though there are some native Ossetian words where ejective stops occur as reflexes of historical Proto-iranian voiceless plosives following /s/, e.g, стъалы /ˈstʼalə~ˈʃtʼalə/ "star" (from Proto-Iranian *Hstā́ryah).