Optional: Deposit collected Memoriam crystals in the middle to see memories.
Go to North side of the room to the door puzzle.
Match the symbols up together to light up the lines in between them three times to open the door, then enter.
Kill the four nihils then enter the next area (to the north). All nihils use special attack after hissing. Each nihil always runs in the same direction. Therefore, a pair of nihil (ice and shadow or smoke and blood) can be killed first, leaving areas between the tracks unused and safe.
The smoke nihil attacks with Magic. Its special attack will decrease Attack, Strength, Magic, Ranged, and Defence by 15. Its charge will decrease these stats by 5.
The shadow nihil attacks with Ranged, and its special attack creates Nex-like shadow bomb at the position of player that deals rapid damage. Players should move away as soon as the floor below him/her is darkened by a circular spot. Shadow nihil darkens the whole screen whenever it approaches the player, both when charging or fighting the player, but this causes no gameplay difference.
The blood nihil attacks with melee. Its special attack causes all incoming damage to heal it, indicated when the creature lowers its head and begin to glow. It also will passively heal other nihil if it is damaged. Its charge inflicts a bleed similar to Slaughter that begins at 100 damage.
The ice nihil attacks with Magic, and its special attack applies a six second stun and drains player's Prayer points by 50% of its maximum. Its charge drains the player's Prayer points by 25% of its maximum.
If a charged engrammeter is used on Freneskae, 25,000 experience is granted, and you take less damage from environmental effects (requires completion of Mahjarrat Memories)
If you visit the Empyrean Citadel throne room and attempt to leave, Sliske will appear and answer one question, before giving you a gift: the ability to see into the Shadow Realm without the ring of visibility (requires completion of The General's Shadow and Ritual of the Mahjarrat). This still happens after Sliske's Endgame.