conj. only; except, but

Qethsegol vahrukiv Bhor fin Golah, wo praal het mulhaan ol Gol saraan onikiv, nunon wah meyz wuth sinon do onik.
This stone commemorates Bhor the Stubborn, who sat here still as Earth awaiting enlightenment, only to become old instead of wise.
(Word Wall for Gol, Bend Will)

May relate to sinon ‘instead’, indicating the contrary, root nuz ‘but’.

Conjunction only, used to indicate the contrary, not used as in ‘only a dragon can fly’ or ‘an only child’.