Green Lantern New Guardians #8

"Betrayed by Sinestro! Arkillo, the most loyal of all the yellow ring wielders, has returned to Korugar only to find the Sinestro Corps is no more! The members of the corps have been rounded up and executed, and the yellow power battery is gone - all at Sinestro's command! Armed with the dwindling energy of a ring he can no longer recharge, it's a race against time as Arkillo slaughters his way toward a desperate goal: the birth of a new type of yellow power ring!"