Migrants of Multiple Earths: Emerald Energies

The year was 1978, a significant period in the Multiverse as there was numerous incursions into adjacent universes by superheroes and villains alike. For example, Earth-Two's Wizard drew four of his cronies in the Secret Society of Supervillains (and his new foe Captain Comet) first to Earth-Three before finally arriving at the world of his birth. In order to get there, he had to purloin items of power possessed by the  Crime Syndicate of America, which led the Society and Comet in direct confrontation versus CSA. After discovering the cause of a mutant plague afflicting Earth-Three, originating from Power Ring's own battery, the Captain used Power Ring's power battery to transport him to Earth-Two where he would "destroy it". Before this could happen. Power Ring retrieved his power battery from Earth-Two when Per Degaton brought him to that reality along with his Syndicate teammates.

Wizard and his Secret Society also on this occasion stole Power Ring's ring of power, Superwoman's lasso and Johnny Quick's speed helmet... which he used to transport himself and his team to Earth-Two from Earth-Three. When they arrived on Earth-Two, these three Earth-Three devices had been left in the Injustice Society headquarters on Earth-Two. These three items were replicated on Earth-One by the adversarial android Amazo, a foe of the Justice League! The Syndicators apparently retrieved them on Earth-Two after they’d been freed from their Limbo prison by Per Degaton during his “Crisis on Earth-Prime” caper.

As for Earth-Three's power battery which Volthoom obtained from a meteor fragment embued with emerald energies from the Starheart of Earth-Two, this battery correlated in Earth-Two's universe with the three yellow power rings possessed by the renegade ex-Green Lantern known as Sinestro, which he used in his never-ending battle with his former masters the Guardians of the Universe, their Green Lantern Corps, and Sinestro's arch-enemy from Earth-One... Hal "Green Lantern" Jordan.

Sinestro obtained his various yellow power rings from the antimatter universe world of Qward, where on that world the Guardian's counterparts the Weaponers developed this technology which they bequeathed their agent Sinestro with during his attempts to conquer his home universe. The yellow rings could syphon emerald energy from the Green Lanterns' power rings and their power batteries, with abilities that matched these devices.