Magma, also referred to as lava, is a reoccurring substance in Battle for BFDI.
Magma makes its first appearance in "Don't Pierce My Flesh", as an obstacle within the Volcano. While Firey easily swims through the substance Leafy, Flower and Bubble have trouble traversing, before realizing they can use Spongy as a platform.
In "Insectophobe's Nightmare", Firey has a lava fall on his Ferris wheel.
Magma reappears in "Don't Dig Straight Down" when Spongy accidentally bursts a crack through a lake in the "Buried Forest, Deciduously Insulated", and the magma, begins to flood everywhere, eventually killing most of the contestants.
It is still present in "The Four is Lava", where it played a part in the challenge. The surviving contestants had to get to Four while avoiding falling into the lava. Later, Flower finds a remote that when pressed, drained all of the lava. The lava drains down Roboty's Waterfall and into Four’s eyeball, where it squirts out with Woody and burns Gaty.
In "The Game Has Changed", Firey places both a lava and water fall on his Ferris wheel so that he and Leafy can both ride it.
In "The Tweested Temple", while everyone else got water, Leafy and Woody get lava as a prize for being safe.
- Magma appears to be resisted by Fork Repellent, as demonstrated by Lollipop in "Don't Dig Straight Down" and "The Four is Lava".
- Magma is the term for when molten rock is within the earth's crust. It only becomes lava when it's reached Earth's surface.
- Metal characters are immune to lava.