Kallisti the Spirit
Kallisti the Spirit is a Magic Origin Stalker, wielding a Soul-bound Quarterstaff and possessing Super Reflexes. She is the fourth Kallisti to arrive from a set of similar alternative timeline known as The Arcanium Timelines.
Arrival in Paragon City
Orphaned in the Massacre of Oxford as a child, the Kallisti who eventually became know as Kallisti the Spirit, was brought up and trained to fight by the Order of Norton Folgate, a martial order of Monks who defended the human survivors against the Demon Hoards.
On a mission to infiltrate and spy on a Demon Lord she discovered the secret that the leadership of The Arcanium was in cahoots with the Demons to preserve the status quo and allow the Arcanium to remain in power over the surviving populace. On discovering this devastating news she returned to the monastery outside Oxford in Albion only to discover it devastated by a Demonic attack and her friends and colleagues killed. Vowing to sacrifice herself and take as many Demons with her as possible, she launched herself to attack only to be swallowed up by the space-time rift and deposited in Atlas Park.
Found by her sisters from the other Arcanium Timelines, she has become an important part of the Kallistiverse.
To read a more thorough depiction of her final mission and arrival in the Kallistiverse, read Kallisti the Spirit Origin Story