Empyrean Ice Propylaeum

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The 4 Elemental Propylaeum dungeons appeared during the Fever Dreams event. Each dungeon consist of three parts, the entry area which everyone completes together, then the upper and lower sides which require you to split into two groups. The reward for the upper side is the Frigid Bracelet. The lower side receives a prism fragment and experience. When you've collected all four prism fragments, they can be combined to craft the Helm of the Elements. Agents of the Arcanum will also give you a writ for completing this quest.

Agent of the Arcanum tells you, "Hail! The Arcanum has asked us to inform all adventurers of an undertaking that you may perform to obtain Writs of Refuge. However, these places are not without their dangers and should not be ventured into alone. We have found large cisterns fueling the magical Essences of Dereth, but something deep within these furnaces is hindering the flow of mana."

Agent of the Arcanum tells you, "Go there, find a means to collect proof that you have assisted in the clearing of this stopgap, and return to any Arcanum Agent with the proof to receive your reward."

The Empyrean Ice Propylaeum is located at 53.2N, 62.5E (Levels 25+) near the Essence of Enchantment (Creature Essence). To reach the dungeon, take the Sennon Valley Retreat settlement portal in Arwic (32.9N, 59.4E). You'll exit at 52.0N, 64.0E, a short run from the dungeon. Newer players should be warned to stay away from the essences, as they are guarded by deadly elementals!

Map: Empyrean Ice Propylaeum

Hammer of Ice
The entry is relatively safe for buffing (Acid, Piercing and Bludgeoning), but you may encounter a few Olthoi. Many players choose to buff at the settlement instead before heading to the dungeon. The first section contains Olthoi Soldiers and Legionaires. Take the first right from the entry and head down the ramp. Fight your way through the Olthoi until you reach the edge of the acid pit. Shift Jump down from the east side of the pit (facing west) and immediately head for the west wall to get yourself out of the acid as fast as possible. When you've cleared the area of Olthoi, go down to the end of the hall and retrieve a Hammer of Ice from the blue chest (30 day timer).

After everyone has a Hammer, take the south passage and head down the spiral staircases. When you reach the room with the two portals, you'll need to split into an upper (bracelet) and a lower (prism) group. Each side will pull a series of levers and switches to open doors for the other side. Choose one person from each group to communicate with the other.

Upper Empyrean Ice Cistern
The Upper Empyrean Ice Cistern contains Frosts, Glacial Golems and Unstable Glacial Golems. This team will be pulling a series of 5 levers for the lower team, then will jump across a grated area to reach a chest containing the Frigid Bracelet.

From the entry take either passage on the east wall. Take the south passage from the next room then head up the ramp until you reach a 4-way intersection. Pull the lever at the end of the south passage (L1), then head north up another ramp until you reach a locked door (Da). When the lower team opens your door, head down the other passage on the east wall and pull lever two for the lower group (L2). Head back to the open room and stay there until the door on the north wall is opened (Db). Pull the lever at the end of the hall (L3).

Next take the west passage and head down a spiral staircase. Go up a ramp heading west, then take the south passage out of the larger room. Before heading up a ramp to the grate area, pull the lever (L4) down the south hallway to open the door at the bottom of the pit for the lowers.

The last part requires some jumping. After heading up the east ramp, you'll have to do a full running jump across to a raised grated platform. Next, head to the SW corner and make a small kitty-corner tap jump over. Pull the lever (L5) to open the final door for the lowers. Make another full running jump to the east, then take the final passageway to the room containing the Chest with the Frigid Bracelet. The bracelet is no-give.

Lower Empyrean Ice Cistern
Like the Upper Cistern, the lower group will also pull a series of levers and go through locked doors to reach the final room containing the Prism of Ice. You'll use the hammer on the prism (acts as a key on a chest) to break off a Fragment of the Ice Prism. Again, you'll be fighting Frosts, Glacial Golems and Unstable Glacial Golems.

From the entry room take the passage straight ahead until you reach the locked door (D1 - immediately after the 4-way intersection). When the upper group opens it for you, wait inside until the upper group reaches their locked door. Pull the lever (La) then head north at the 4-way intersection. Head down a ramp, then go straight heading east and wait at your 2nd locked door (D2). Again, when the upper group opens it, wait until you get the signal to press the button inside (Lb).

Next you'll be heading to an open room with large stone heads. From the button room, take a right at the 4-way intersection and an immediate left at the split. Go through a room and take the passage on the north way. Head down a small ramp, then follow the passage until you reach the locked door (D3). Once the upper have opened it for you, head through, fighting the golems, go down a ramp, and you'll reach the edge of the Ice Pit.

Important: wait at the top of the pit until the uppers have opened the door on the north wall of the pit below!  After you've jumped, go down the ramp, take a left at the T. The small room you'll enter is full of dispel traps! If you need, re-buff in the hall. You'll next enter a big room with a locked door on the north wall (D5). After the uppers have opened it, jump across the entry to avoid another dispel trap. The final room with the Prism of Ice is ahead.

Use the Hammer of Ice on the Prism to unlock it and retrieve your Fragment of the Ice Prism. Make sure the Prism is locked and the Fragment has had time to respawn before opening it or you will waste your Hammer!

The Prism of Ice has been unlocked.
Your key is used up.
"The Prism Shakes and you hear a rushing sound from outside the room."

Take the Fragment of the Ice Prism to any Agent of the Arcanum for your reward, 250,000xp, a writ and a Craftable Prism Fragment of Ice. The Craftable Prism can be used to make a Helm of the Elements. A Writ may only be obtained your first time through this quest, but you'll get the xp reward every time.

Note: once the Fragment has been made craftable by an agent, they may then be given.

You give Agent of the Arcanum Fragment of the Ice Prism.
Agent of the Arcanum tells you, "Wow! Great work. Here is your reward. Was it cold in there?"
You receive 250,000 experience.
Agent of the Arcanum gives you Writ of Refuge.
Agent of the Arcanum gives you Craftable Prism Fragment of Ice.
Agent of the Arcanum tells you, "We only wanted to see that you had achieved what we asked. Seeing as how you did so well you should keep this."
Agent of the Arcanum tells you, "You never know, you may find a use for it yet."

See also

Empyrean Lightning Propylaeum
87.1S, 9.6E (Levels 50+)
Empyrean Fire Propylaeum
73.5N, 2.6W
Empyrean Acid Propylaeum
31.6S, 74.2W (Levels 50+)
 

Acid Propyleaum
Fire Propyleaum Ice Propyleaum Lightning Propyleaum

Thanks to Matthew the Hawk, Charissa Lightbringer of WE, Archmage Corin of FF, Savine of TD, Jaguar, Mazoch of WE, Skam Jim-One of LC, Mynamoto, Sneaky Snake of WE, Doogen of TD for preliminary information.

Special thanks to Hogann of TD for leading the quest.