What happens to Iskahn and Sheyta? In Chapter 21 of Alicization,


   when Sheyta's sword breaks, it appears they are doomed as the red army closes in.


However, 


   Leafa comes to save them with the orcs. When she kills everyone and collapses from exhaustion, no other mention of Iskahn (and Sheyta) that I know of appears in the rest of Volume 17 and Volume 18.


What happens to them?
They appear in 


   Moon Cradle, the sun-arc after Alicization.


I haven't read the arc personally but from looking at illustrations,


   they help out zkititi within the story. Also, they have a baby.