Leo was a virtual representation of one of Arno Dorian's genetic memories, relived by a Helix initiate through the Helix Navigator.
Arno solved several riddles to find a part of the Nostradamus Disc.
Above the dark shadows
Of the erstwhile bastion,
The tall square Sentinel silently watches
The 9th month spill his blood.
The martyrs of Herod,
In their ageless temple,
Haunt the alchemist's stones,
With their macabre, soundless dance.
In the Belly of the World,
The Saint of the Holy Stag
Still waits for his Austral hand
To reach the godly heavens.
Arno retrieved one of the fragments of the Nostradamus Disc.