Contagious Fireball (3.5e Spell)

''As the flames consumed the orc, its body began to give off small motes of burning sparks as it moved. One small flame should set the rest of him ablaze.''

This spell acts like fireball though it caps at 15d6 at 15th level. Those who fail the saving throw become "infected", and their body emits small motes of orange light. If the creature takes at least 1 point of fire damage, they explode into another contagious fireball with a caster level equal to their CR (no save for the exploding creature) which may then subsequently infect more creatures. Those who have been infected once cannot be infected again by the same casting of this spell, even from its subsequent spawn. In theory the explosive chain can go on forever, provided a creature infects another each time.

Infected creatures can have the explosive effect removed via break enchantment, dispel magic, or taking at least 30 points of cold damage.

Material Component: Diseased bat guano.