The secret portal cosmetic in Diablo 4’s Echoing Hatred activity is called the Howling Mouth of Madness portal skin. It’s currently a hidden reward tied to a secret mechanic inside the new endgame mode. Community testing has basically solved it now. Read this D4 secret portal skin guide, we'll tell you the best way to unlock Howling Mouth of Madness in Echoing Hatred.
What is Echoing Hatred in Diablo 4?
Echoing Hatred is an endless survival arena added with the Lord of Hatred expansion: enemies scale infinitely, bosses start stacking and an “Overwhelm” meter ends your run if too many enemies survive.
What is Secret Portal Skin in Diablo 4?
The hidden portal cosmetic is one of the first major secret rewards discovered in the mode. The Howling Mouth of Madness portal has:
a red fleshy/mephisto-like appearance
screaming mouth visuals
corrupted hatred effects
Players who unlocked it showed it off on Reddit and streams shortly after solving the puzzle.
How To Unlock The Howling Mouth of Madness Portal in Diablo 4
Step 1 — Unlock Echoing Hatred
You first need a D4 rare item called Trace of Echoes. Use it at the Sightless Eye altar in Temis to enter Echoing Hatred. Community reports say the key can drop from:
Nightmare Dungeons
Kurast Undercity
Helltides
Random Torment content
Step 2 — Activate Shrines In The Correct Tier Ranges
Inside Echoing Hatred, you must activate specific shrine types during specific wave tiers. The solved order is:
| Tier Range | Shrine |
|---|---|
| 1–9 | Protection Shrine |
| 10–14 | Artillery Shrine |
| 15–19 | Lethal Shrine |
| 20–24 | Channeling Shrine |
This was discovered from the hidden corpse messages and later confirmed by multiple players. The corpse clues reference:
Shield → Protection
Arrows → Artillery
Death → Lethal
Madness / golden cup → Channeling
Step 3 — Kill Flotsam The Goblin
After completing the shrine sequence correctly, a special goblin named Flotsam appears later in the run. You must kill it before dying. That grants:
The hidden achievement
The Howling Mouth of Madness portal cosmetic
1. You only need ONE shrine activation per range
Any Protection shrine between Tier 1–9 works. Any Artillery shrine between Tier 10–14 works. It does NOT need exact tiers.
2. Do not activate the wrong shrine first
Players reported failed runs if shrines were activated out of order, multiple shrines were used incorrectly and the sequence was skipped.
3. The corpse lore matters
A hidden dead Amazona body can spawn in corners of the arena during runs.Interacting with it gives cryptic lines hinting at the shrine order.
Diablo 4 Best Strategy Farm Secret Portal Skin
Because Trace of Echoes keys are extremely rare:
Bring your strongest AoE build
Save shrines until the correct tier range
Avoid accidentally clicking the wrong shrine
Have high mobility ready for Flotsam
The goblin reportedly appears after the sequence is completed successfully.
