Lost Souls: 8
Doors: Gold, Copper
Keys: Argent, Copper x2
Once in limbo, jump on the platforms until you reach a red crystal obstacle. Switch to Eryx and smash it open. Then, head to the crystal on the ground and perform a stomp.
Make your way across the overturned bridge and continue defeating waves of enemies you encounter along the way. You may want to try using the Eryx to get accustomed to its combos and power. After taking out the tyrant, you'll arrive at the Central Penitentiary.
Continue along the path until you reach some red crystals. Ignore them for now and turn to the left to find a lost soul. Free it then destroy the obstacle.
Continue to the next area then use angel lift and boost. After reaching the next ledge, you'll find an angelic web. Ignore it for now since you don't have the means to reach it yet. Go down the ramp a bit, then jump to the ledge on the left. Pull the platform under the container van then step on it. Use the Eryx to smash the container open to give you access to the large vital star behind it.
Turn around and you'll find another ledge to the right side which leads to an enclosed floor with a Lost Soul and a golden door. (Secret Mission: Divergent Slaughter)
Lost Soul and Golden Door: Overturn
Get back on track until you reach a divinity statue. From there, you can reach a hidden argent key.
After getting the key, continue forth and enter the next area. Clear the enemies here and move to the exit. Continue to another area where you'll meet yet another enemy, the Rage. If you kill one of them, the other will become more powerful so beware. After taking out the enemies, jump through the hole on the wall then turn around to find another lost soul.
Continue to the next area and head to the right side. Follow it and you'll find yet another lost soul behind the wall.
Head to the left this time and follow the path. Take out the first wave of enemies along the way then continue up to the top floor. Before leaving the ramp, turn around and jump across the ledges to find more red orb sacs and another lost soul at the end.
Backtrack then smash the lift down. Leave the lift and head to the next area. Don't smash the floor yet; instead, look around to find another lost soul.
After landing, just look around and you'll find a Copper Door. If you don't have a copper key with you don't fret. There's one nearby and you just need to grab it. Kill the two Rages first then use angel lift to reach the hallway. Don't head there; instead, turn around to find the key and open the door below. (Secret Mission: Angelic Warfare)
Copper Key and Door, Overturn
Return to the hallway and continue until you reach the divinity statue. From there, turn around to find more red orb sacs and another lost soul. Leave the place.
After the scene, make your way to the old man and defeat the harpies to complete the mission.