# Can the Create or Destroy Water spell completely dehydrate a person?

The human body contains approximately 60% water on average. (According to the USGS). The spell Create or Destroy Water states: "You destroy up to 10 gallons of water in an open container within range." In addition, "When you cast this spell using a spell slot of 2nd level or higher, you create or destroy 10 additional gallons of water". A gallon of water weighs roughly 8.35 pounds.

Say there's a human who weighs 200 pounds. 60% of 200 is 120 - approximately 120 pounds of water are in this person. dividing 120 by 8.35 = around 14 - so those 120 pounds of water are, in other words, around 14 gallons. The destroy water spell can destroy up to 20 gallons.

According to these measurements, "destroy water" could theoretically completely dehydrate a 200 lb human.

The biggest argument against this in my eyes is that the water must be in an "open container". However, the human body is technically the container of the water. Thus, if a barbarian takes a big slash across the torso, resulting in a large open wound, the wounded human may, technically, count as an "open container".

Now, the 64 million dollar question - would "destroy water" dehydrate a human with an open wound, removing all water from their body and instantly killing them?

• – nitsua60
Commented Feb 13, 2018 at 0:47

## Allowing you to target a person makes the phrase meaningless

What is a "container"? Merriam-Webster says,

a : a receptacle (such as a box or jar) for holding goods

Is a human a receptacle for holding water? The wording of the definition suggests that there is some intent--that the object is intended to hold water, in this case. Do people keep humans around to hold water? That seems unlikely.

However, let's say that humans are valid "open containers". Then, what is not an open container? Sure, the human's blood is "open," in some sense, but the vast majority of it is still inside the body. If we say that the wound makes that "open," then basically any gap is "open". Therefore, literally everything that has any water in it is an "open container". Heck, why use the level 4 spell Blight to kill plants, when plants are "open containers"?

Finally, consider game balance. Should a 1st level spell be an instant kill on any humanoid that's taken damage? Probably not. You can often do crazy things with magic in D&D, but it is ultimately a game, and not a physics simulator.

Although there's already an excellent semantic answer to this question, there's also a RAW answer. From the "Targets" section for spellcasting on p263:

A typical spell requires you to pick one or more targets to be affected by the spell’s magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect (described below).

In other words, there are three distinct possible targets for (a mode of) a spell: a creature, an object, or a point in space. Create or Destroy Water specifies modes that target objects and modes that target points in space, but no modes that target creatures.

This came up as a suggestion of cleverness by a younger campaigner in a group recently, but their thought was regarding drowning a person by creating water inside the lungs. I put the kibosh on that by telling him 1) it would be a called shot on a target (the lungs) under complete cover 2) using the spell in this manner demonstrates a particular level of evil, (I'm not alignment heavy, but the player is), and 3) if I allowed this use of the spell I would extend that use to NPCs.

I would add two things to this of destroy water to balance the game. If a character wanted to use this as an attack, I would suggest that they research necromancy and dehydration and make a new necromantic spell as this spell demonstrates a manipulation of the element of life, not just water.

• +1 for citing your experience handling this at the table, and for the conclusion that what they're describing is, functionally, a different spell. Commented Dec 30, 2019 at 15:28

# No. Spells do what they say they do, and it doesn’t specify any damage rolls.

Create or Destroy Water doesn’t specify any damage rolls in its Destroy Water mode. If it was capable of desiccating creatures, it would do so. As an example of a spell that is capable of damaging creatures this way, look at Abu Dalzim’s Horrid Wilting (Elemental Evil, 150) - it does a large amount of necrotic damage to creatures struck by it.