Originally Posted by
Swordguy
Got it! Eschew Materials feat + Major Creation.
There's no book value listed for either Osmium or it's antimatter counterpart. Just summon Anti-Osmium to the limit of your casting ability in contact with the critter. (Point of order: given an Earth-equivalent density, and assuming it has the DR of rock at all points, it takes a 17th level caster to summon enough Anti-Osmium to fragment the planet. Imagine what a 50th could do.)
EDIT:
Osmium is 22610 kg/cubic meter. A 50th level caster summons 50 cubic feet, or a cube 3.7 feet to a side. This converts over to be roughly 15.25 cubic meters, for a final density of 344,802 kg. 1 gram of antimatter produces roughly a 43 kiloton reaction (doubling once the matter is added into the equation, so the detonation of 1g of AM in contact with 1g of matter is 86kt). We have 344,802,500 grams of anti-osmium, for a total yield of 29,653,015,000,000 kilotons. (these are metric tons of 1,000kg each, for a total of 29,653,015,000,000,000 kiloGRAMS of TNT) 1 lb of TNT does 3d6 damage, or, converting over, 0.454 kg of TNT does 3d6 damage. So, dividing 29,653,015,000,000,000 by 0.454 yields 65,315,011,013,215,859 increments of 3d6. So, multiply by three, and get 195,945,033,039,647,577d6 damage.
Congratulations, you've just done 195 quadrillion damage minimum. Your average damage is 685,807,615,638,766,519 hp.
685 quadrillion hp damage. That ought to blow through most DR. And it's not fire damage (even though TNT is usually thought of that way). It's just plain old force damage.