A Magma Bomb is a type of Imperial starship weapon munition that is the most common payload of the Bombardment Cannon used on Adeptus Astartes warships. Magma Bombs, which can also be fitted as warheads onto naval Torpedoes, are a very potent form of plasma explosive that can incinerate even the most hardened of planetary fortifications or most durable types of starship armour-plating.
The heat generated by Magma Bomb explosions is so intense that when used on planetary surfaces they have been noted to cause rivers and other free-standing bodies of water to boil away, leaving behind surfaces caked in dust and bare bedrock.
- Angel Exterminatus (Novel) by Graham McNeill, Ch. 1
- Battlefleet Gothic: To Cleanse the Stars - Vessels of the Imperium, pg. 21