Kerrigan 's psionic call was sent some time after Amon 's defeat on Aiur .
Some time after Amon 's defeat on Aiur , Kerrigan sends a psionic call to Raynor and Artanis , directing them back to Ulnar as a staging ground for an invasion of the Void as well as permanently ending Amon 's threat .
StarCraft II-COLON- Legacy of the Void