The voiced velar spirant [ɣ] appeared in Old Ilkorin, but no longer appeared in Ilkorin by the time of the wars of Beleriand, having developed into [g] initially (PE19/19) and vanishing medially (PE19/23).
References ✧ PE18/104; PE19/23
|ᴹ✶-kh- > -h-||[-kʰ-] > [-x-] > [-ɣ-]||✧ PE19/23|
||✧ PE19/23 (-ŋ- > (ʒ))|
||✧ PE19/23 (-h- > -)|