Horlith slithers forward to AZ12 and casts magic missile, sending two missiles toward "the other goblin" (not Versevosh) if Horlith can see him. Otherwise, Horlith shoots Inoklar again.
Perception:1d20 + 12 ⇒ (7) + 12 = 19 (includes the +2 for dim illumination)
Magic Missile 3:2d4 + 2 ⇒ (1, 3) + 2 = 6