- "Create a ring of ethereal fire that boosts damage for you and allies. Normal enemies who enter gain a burning effect that deals fire damage. Last 15 seconds."
- — Create-A-Class description
Ring of Fire is a Field Upgrade introduced in Call of Duty: Black Ops Cold War Zombies. It creates a ring of ethereal fire that boosts damage for players. Normal enemies who enter gain a burning effect that deals fire damage, and it lasts 15 seconds.
Starting at Level 53, players can upgrade the Ring of Fire's effects with the use of Aetherium Crystals.
- Upgrade I: Double burn effect damage -- 1 Raw Aetherium Crystal
- Upgrade II: Ring blocks enemy projectiles -- 2 Raw Aetherium Crystals
- Upgrade III: While in the ring, ammo is taken from the player's stock instead of the magazine -- 3 Raw Aetherium Crystals
- Upgrade IV: Burning effect has a small chance to insta-kill -- 4 Refined Aetherium Crystals
- Upgrade V: Ring duration, burn effect, and insta-kill chance all increase the longer the player is inside -- 5 Flawless Aetherium Crystals