You cannot find the Assassin's Curiass in The Elder Scrolls IV: Oblivion. It's a unique light armor cuirass from The Elder Scrolls III: Morrowind (worn by the Dark Brotherhood assassin in the "Assassin" quest). No items transfer between games—each Elder Scrolls title has its own loot tables.
If you want heavy armor (since Curiass is light), here are the best paths:
| Tier | Set | Base AR | Where to Find |
|---|---|---|---|
| Early | Iron / Steel | 30 / 35 | Merchants, bandits, Imperial City guards |
| Mid | Dwarven / Orcish | 45 / 50 | Dwemer ruins, Orc strongholds, level 12+ loot |
| Late | Ebony / Daedric | 60 / 70 | Level 20+ loot, Daedric shrines, high-level conjurers |
| Unique | Goldbrand (artifact) | — | Boethiah's Daedric quest (not armor) |
| Unique | Cuirass of the Savior's Hide | 50 (Light) | Hircine's Daedric quest |
player.additem 0003DB3E 1 ; Daedric Cuirass
player.additem 0003DB3D 1 ; Ebony Cuirass
Want a specific heavy armor recommendation for your level/build? Tell me your level, major skills, and playstyle.