Magma
Magma appears when a Blockhead reaches the center of the world. It glows slightly with a reddish tint, which allows some ores to become faintly visible before they normally could.
A Blockhead will begin to smoke as it nears magma. This is to warn a Blockhead that it will be injured if it gets too close (approximately 25 blocks). Despite this, Blockheads can walk on magma.
Magma does not lay at a single, consistent level, but may rise or fall from left to right, often in association with the presence of mountains and oceans above. It cannot be harvested.
Water can be poured on magma in order to turn the water into basalt. If not enough water is placed, it will become steam.
Gold ore is typically found within 200 blocks of magma.
Gallery
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Magma
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It's very hot