Implosion
Template:Spelltable Rains down molten magma and rocks into single enemy stack, dealing the highest spell damage in game Template:Skills
Comments
Single most powerful targeted damage spell in the entire game. Its damage scaling is vicious, and it can easily annihilate even the most resilient of enemies (excluding the higher-level Golems, even if you had Power 99 (*) and Orb of Silt)
(*) magic resistances: a Stone Golem has 50%, an Iron Golem has 75%, a Gold Golem has 85%, a Diamond Golem has 95%, a Crystal Dragon (also a crystal creature, not a golem) has 20%)). So the most damage resistant golem only takes 5% of the damage done. At Power level 99 and Expert Level Earth Magic (300 base damage not 100, same multiplicator (75 damage each power point),-25 mana not 30) the whole damage would be 7725 damage points, 5% of which(7725*0,05 =386.25) would be 386.25, a stack of about 6 golems.
With an Orb of Silt (+50% earth magic damage) the damage would be 11588 damage points 100% damage, and the 5% effective golem damage would result in 578 damage points, shredding no less than and about 9 golems with 60 health points each. Maybe diamond gathering via golem destruction is a spending a nice time relaxing from getting rid off 46 units of Golden Dragon creatures, and at the time one has reached 99 power mana points (via buildings like School of Magic or Library of Enlightenment) the wasted mana may not be a scarce ressource.
Of course using Summon Earth Elemental (also a 5th level spell) would be a little bit brutish as it would work without having to cirumvent or consider magic resistance.