1.) Throughout the map you can find 10 potential spawns for bull symbols. 4 will have symbols in the dame Fire at the Symbol with the fire blast to spawn in a gladiator.
2.) Kill the gladiator to have its soul collect by the Ra statue (can be killed anywhere)
Location
1. Danu Altar Room
2. Arena
3. Ra Tower: Burial Chamber
4. Temple
5. The Pit
6. Odin/Zeus Temple Entrance
7. Danu Tunnel
8. Wall near bridge between Zeus and Odin
9. Flooded Crypt