Personal Info:
Real Name: Sarko
Also Known As: No known Alias
Place Of Birth: The Future
First Appearance: Hal Jordan and the Green Lantern Corps Vol.1 #19 (2017) Modern Age Villain
Known Associates: Cataclysm
Group Affiliation: Sinestro Corps
Base Of Operations: Mobile
Grudges: Green Lanterns
Creators: Robert Venditti and V. Ken Marion
Time Travel: Sarko has access to time travel technology and has travelled back to present day earth.
Krona's Gauntlet: Sarko has access to Krona's Power Gauntlet. The Gauntlet itself gained sentience and developed a body for itself, becoming the entity Cataclysm. Cataclysm aided Sarko by using his power to create the Prism Beasts that are composed of pure willpower and are unaffected by Green Lantern and Qwardian power rings.
At some point in the future Sarko was born to Soranik Natu and Kyle Rayner. Later, Sarko would develop an obsession with his grandfather, Sinestro, and come to believe that the universe needed the Sinestro Corps as be believed that the Green Lanterns had failed. Sarko resolved to bring back the Sinestro Corps by travailing back in time to make sure the Sinestro Corps was never dissolved.
Sarko at DC Database
Sarko at Comic Vine