This article is a comprehensive guide to Undying Oneiros in Duet Night Abyss (DNA), covering their rating, recommended characters, stats and skills,how to get, and more.
All Weapon ListTable of Contents
Undying Oneiros Tier and Stats / Skill

| Category | Weapon Type | DMG Type |
|---|---|---|
| Melee | Whipsword | Spike |
Weapon Stats
| ATK | 21 | Explosion Range | - |
|---|---|---|---|
| ATK(Lv.Max) | 263.6 | ATK Range | - |
| Crit Chance | 20% | Multishot | - |
| Crit DMG | 225% | Mag Cap. | - |
| ATK Speed | 1 | Max Ammo | - |
| Trigger Prob | 30% | Ammo Conv. Rate | - |
Weapon Skill
| Default | Max HP +50.0%. When this weapon triggers a bonus effect on hit, grants +8.6% Max HP for 15.0s (up to 10.0 stacks). |
|---|---|
| Max | Max HP +100.0%. When this weapon triggers a bonus effect on hit, grants +17.2% Max HP for 15.0s (up to 10.0 stacks). |
How to Get Undying Oneiros
Exchange With Secret Letter Clues

Undying Oneiros's Secret Letter can be exchanged with Secret Letter Clues in the Shop. 1 Secret Letter will require 10 Secret Letter Clues. The shop is unlocked upon gaining access to the Sanctuary in Act 1.
How To Get Secret Letter CluesUse Secret Letters in Covert Commissions

Secret Letters can be used during Covert Commissions to get a chance for the weapon's blueprint and materials to drop. Since Undying Oneiros is a Whipsword, it will only need 2 weapon-specific components. Blueprints are consumed when forging a weapon. You will need a total of 6 blueprints and the corresponding materials to fully max a weapon.
Recomended Characters
| Character | Explanation |
|---|---|
Sibylle | - Sibylle's current BiS. This provides her with so much HP, which in turn, will increase the damage of her Summon. This is due to the Summon scaling from her HP |
Truffle and Filbert | - Truffle and Filbert's skills scale with her Max HP. Since Undying Oneiros grants the largest HP boost amongst weapons, it can massively enhance Truffle and Filbert's skillset. |
A weapon that provides a very large increase to maximum HP, and even more HP when it Triggers bonus effects. Equippable by any character and beginner friendly since it provides added survivability.