Lost Souls: 7
Doors: Gold, Ivory
For the early part of the mission, destroy all enemies Lilith throws at you until the scenery changes. Before moving forth, turn around to find a platform. Double-jump to reach it then free the first lost soul in the middle.
From that platform, you'll find angel lift targets that will take you to the Gold Key and Ivory Door on both sides.
Gold Key and Ivory Door, Devil's Dalliance
Go past the divinity statue but don't go up the ramp. Check underneath it to find a lost soul.
Go up the ramp then stomp on it to create a walkway. The red walkways are demonic floors while the blue ones are angelic. You have to hold RT (Arbiter or Eryx) to be immune on demonic floors while holding LT (which equips Osiris or Aquila) makes you immune on angelic floors.
Make your way to the floating platform to the right. Here you'll find some green critters and a lost soul.
Angelic/Demonic Floors Lost Soul, Devil's Dalliance
Continue forth to the wide area where you'll have to fight a wave of enemies. Take note that floors start off as neutral but will change to demonic and angelic floors by sequence. After taking out the enemies, stomp on the floor to continue. In the next platform, you have to kill the minions within 30 seconds to clear the challenge. Next, take the upper pathway which will lead to a pressure plate which will grant you access to a vitality star in the platform above.
Jump back to the main path then continue to the last platform (round 3). This is just a simple skirmish with some challenging mix of enemies. Put what you have learned so far into use and grind them to dust. Take note that the floors are also changing types so be wary what weapons you are using all the time.
After clearing the round, stomp on the pressure plate and you'll find yourself in a dark blue room. Turn around and you'll see a lost soul on the wall. Continue to the next room and clear it of rage spawns to continue.
Ignore the pathways that will be created but instead, use angel boost to get in range of an angel lift target on the floating platform to the right. Continue to the next platform and stomp on the pressure plate to create a walkway to the next platform. You should find another lost soul on the wall.
Blue Floor Lost Soul, Devil's Dalliance
Head to the next platform and kill all enemies to reveal the pressure plate. Activate it and continue forth. In the next room, you have to fight the dangerous enemy you fought in the Order's headquarters. Prolong the battle long enough and this enemy will escape, revealing a pressure plate on his wake. Continue upstairs to find yourself in the golden platforms with a divinity statue nearby. Before moving forth, check the lowered platform to the left to find this mission's Argent Door. (Secret Mission: Argent – Hasty Acquisition)
After completing the secret mission/ finding the door, don't proceed yet. Look around to find an angel lift target on a floating platform in front of the divinity statue. Get yourself there then look up behind you to find another angel lift target. Go up there and to the next platform containing a devil trigger star and a lost soul.
Secret Devil Trigger Lost Soul, Devil's Dalliance
Get back to the main path and continue until you reach another platform where the last lost soul is located. Stomp on the pressure plate to continue as well.
Take any of the pathways then continue ahead until you reach the last room. Here, you'll fight two types of rages; the Ghost Rage which can only be hit and damaged by angelic weapons and the Blood Rage which can only be damaged by demonic weapons. Defeat these last two enemies to complete the mission.