Zorya
the two dawns, wardens of the sky
airThe Zorya are the sisters of dawn and dusk who open and shut heaven's gate and guard the chained hound that would devour the world; to dream of them is to be kept safe through the turning of the night by watchers you will never see.
Fragments
Beneath the pole star they keep the great hound chained, and should both sisters ever sleep at once, the beast will slip its leash and the sky will end.
The morning sister flings wide the eastern gate for the sun to ride out; the evening sister bars it shut behind him, and between them not one hour is left unguarded.
dawnduskstarsguardiansthreshold