conj. in which, during which, where, whereat

Het mah Arnvid faal Staadnau, wen Hass denos mindin Kein do Galik, kolos rok ofaal dilos ahraan.
Here fell Arnvid the Unbound, whose Health declined after the War of Pines, in which he received a deadly wound.
(Word Wall for Haas, Drain Vitality)

Compound of ko ‘in’ and los ‘to be’.

Conjunction only, not to be confused for the adverb ‘where’ as in ‘Where is Whiterun?’.