The zappy power coming out of the blacked out Titan is puzzling
That appears to be his ring - Phantasm, Pantha, Hawk (Dove? Hard to tell with the redesign), and Aquagirl have the same thing going on - although the blacked out guy's is darkest, the others have different tones - HawkDove's got a slightly lighter blue-grey than BlackedOutGuy, the other three are a little closer to white - and my eyes keep changing which one they perceive as darker, so I'll leave it at that. Perhaps it's an indication of how many people they've killed since returning - the darker the more power? On the other hand, Phantasm, Pantha, and BlackedOutGuy all have big power flares from their rings, where HawkDove and Aquagirl have wee ones, so maybe that's the power indicator.
Side-note, writing that paragraph pointed out just how awful that cover is...the Black Lantern colour scheme (black, silver and grey), with the earth-tones of the ground, and how most of the corpses have discoloured, and the only possible sources of colour (the live Titans, and the city) being mostly off-panel or deep into the background, deemphasized - and, looking at Beetle's glove, desaturated, somewhat - it's just a yucky cover, and not in the disgusting/scary way one would hope a zombie cover would be. It's just...unpleasantly blah.