Blasphemous Act

This spell costs {1} less for each creature on the
battlefield. Blasphemous Act deals 13 damage to
each creature.
"Endlessly, the wyrm uncoiled from her molten abyss.
Grimnir hefted his axes and charged. The titanic
clash that followed flattened hills and created the
Plains of Aqshy, but neither would submit. The foes
smashed into one another until god and beast alike
rained down as a hail of blazing meteors."
— Age of Sigmar 2nd Edition Core Book