From Ars Magica
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Blast everything near you backwards.
All enemies within the radius defined by [4 * (Casting Mode + 1)] are thrown backwards. Force increases significantly as the Casting Mode is raised.
The spell also destroys certain types of blocks within the radius. The blocks destroyed are:
Leaves, Snow, Torches, Redstone Torches, Cactus, Dead Bushes, Crops, Glass, Mushrooms, Flowers, Sugarcane, Vines, Tall Grass, Saplings, Glass Panes, Water Lilies, Spider Webs.
Blocks destroyed in this manner have a chance to drop their specified item, much like an explosion.