Magma Stone

Type	AccessoryCrafting material
Tooltip	Melee attacks inflict fire damage
Rarity
Sell	2 GC
Research	1 required
Debuff	Hellfire(Desktop, Console and Mobile versions)
Debuff tooltip	Slowly losing life
Chance	100% (Desktop, Console and Mobile versions)
Duration	2–6 seconds
Debuff	On Fire!
Debuff tooltip	Slowly losing life
Chance	100% (Old-gen console and 3DS versions)
Duration	2–6 seconds

Debuff duration
Duration	Chance
6 seconds	2/8 (25%)
4 seconds	3/8 (37.5%)
2 seconds	3/8 (37.5%)

The Magma Stone is an accessory that drops from Lava Bats (2% chance) and Hellbats (0.67% chance) in The Underworld. It causes the wearer's melee attacks to inflict the (Desktop, Console and Mobile versions) Hellfire / (Old-gen console and 3DS versions) On Fire! debuff on enemies, and also add orange flame particles effect on both the weapon sprite and their projectile that gives off light. The duration of the debuff is random, and varies according to the table on the right.

Crafting

Recipes

Result	Ingredients	Crafting station
Magma Stone	Lava Charm	Shimmer Transmutation(Desktop, Console and Mobile versions)

Used in

Result	Ingredients	Crafting station
Lava Charm	Magma Stone	Shimmer Transmutation(Desktop, Console and Mobile versions)
Fire Gauntlet	Magma Stone Mechanical Glove	Tinkerer's Workshop
Molten Quiver(Desktop, Console and Mobile versions)	Magic Quiver Magma Stone	Tinkerer's Workshop

Notes

Though the tooltip does not specifically say so, the fire effect works not only on melee weapons, but also tools that inflict melee damage such as pickaxes, axes and hammers.
Whips are not affected by the Magma Stone, despite being affected by many melee-related stats, and even the other bonuses of the Fire Gauntlet.

Tips

Lava Bats are three times more likely to drop this item than Hellbats, so farming for it in Hardmode is more efficient than in pre-Hardmode.
The Magma Stone's effects stack with those of Frost armor, flasks, and the Shadowflame Knife(Desktop, Console and Mobile versions).
Using the Magma Stone with any yoyo(Desktop, Console and Mobile versions) is useful for quickly mapping out underground caverns.
The Magma Stone can be very useful when dealing with the Hungry. However, the Wall of Flesh itself is immune to both debuffs inflicted by the Magma Stone.