A portable invisibility device. When activated, the world wraps around the user - distorting vision causing everything to appear as if one is looking through dirty water. With the ghostCloak, a battery pack sits on the tailbone that burns up and overheats batteries quickly. Meaning it's good for short bursts but needs time to recharge.
In Golden Son, Octavia au Lune tries to escape from Agea on Mars with an entire ship wrapped in a ghostCloak, which Darrow calls "impossibly expensive".