[RPG] If a creature is dropped on a monster, how much damage does each of them take

damagednd-5efalling

If a character who was under the effect of a growth potion (double their height and eight times their weight) and weighed 2,400 lbs. was able to use Dimension Door to teleport 400 feet or more into the air, directly above a Huge-sized monster, and fell on it, how much damage would the falling creature – and the monster – take?

I would assume both would take the 20d6 max for the falling over 200 feet, but is there a estimation on additional damage for the falling creature's size?

According to the splat calculator, at 500 feet you'd be falling at 196 km/hr, and it would expend 1.6 million joules of energy, the equivalent of over 3,000 mid-sized cars hitting an object at 60 km/hr.

A 2,400-lb. barbarian falling 500 feet is like dropping a mid-sized Toyota Corolla off a 50 story building onto a monster – it should do some damage.

Best Answer

The best relation is the Falling Roof Trap listed in the DMG and Phandelver Module. If triggered, it deals 4d10 bludgeoning damage, but allows for a DEX save. Here, you're dropping something significantly larger, from a greater height.

You can reach back further to 3.5 and compare it against the Siege Engines. A heavy Catapult launches a sizable stone for 6d6 bludgeoning after traveling an arc with a base of at least 100 ft. Again, this is something larger, falling from a greater height.

The math for this starts with the understanding the surface area of the impact to determine the DC for a dex save, a perception check with a decreasing DC to perceive the falling man, and an estimation of the mass of the falling object. For a base assumption, refer to page 249 of the DMG for Improvising Damage. This is less than a crashing flying fortress, but more than compacting walls. In terms of Damage Severity, this should be at least deadly for any one caught in the center of the target area, and dangerous for those on the edge.

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