The Inferno Potion is a buff potion that grants the Infernobuff when consumed. It casts a ring of fire around the player that deals 10 damage per second and inflicts the On Fire!debuff for 2 seconds on enemies inside, as well as giving off light. Critters and other passive NPCs are unaffected. This lasts for 4 minutes, but can be canceled at any time by right-clicking the icon (), by selecting the icon and canceling it in the equipment menu (), by double-tapping the buff icon (), or by canceling the buff from the buffs screen ().
On the Nintendo 3DS version, the inferno keeps damaging enemies when going to the armor section in the player's inventory. However, the timer for it will still go down.
While the ring deals minimal damage to most Hardmode enemies, it is very useful against enemies that throw destructible projectiles, as these are easily destroyed by the ring. Examples include Duke Fishron with his Detonating Bubbles and Plantera with her spores.
The ring of fire that appears when using the Inferno Potion.