The "Green Lantern #18 (2007)" comic book is a significant issue in the DC Universe, featuring the first appearance of the character Karu-Sil. Written by Geoff Johns and illustrated by Daniel Acuna, this single issue from the "Green Lantern" series showcases the Green Lantern Corps and Justice League America team. The cover variant features artwork by Ivan Reis, making it a valuable addition for fans of action-packed superhero adventures in the Modern Age era of comics.