Green Lantern Corps #56 (Vol 2)

The Sinestro Corps is engaged in combat with the Weaponer, while the Green Lantern Corps is entangled in the ensuing chaos. The question arises: will the GLC break its truce with the masters of fear to safeguard the innocent Qwardians? Is the Weaponer the harbinger of doom for his own world? Moreover, what part does Firestorm have in this tie-in to BRIGHTEST DAY?