ECLIPSE PHASE: INDISPENSABLE UNIVERSE-APPOINTED SENTINELS
Sybil is a Promethean Avatar who sometimes channels a Promethean named APOLLO.
Sybil is a mobile representation of the Sybil painted on the Sistine Chapel. She seems a living oil sculpture in VR or simulspace. She has a few timeshared morphs at a distant body bank controlled by Firewall if needed.
Sybil is essentially a Promethean Avatar from the Firewall sourcebook.