The mysterious stranger teaches a lesson about the Mage hand spell.
"Mage Hand" is a cantrip in Dungeons & Dragons 5th Edition (D&D 5e) that allows a caster to create a spectral, floating hand that can manipulate objects, open unlocked doors or containers, stow or retrieve an item from an open container, or pour the contents out of a vial. Here are the full details of the spell:

Spell Name: Mage Hand
Level: Cantrip
Casting Time: 1 action
Range/Area: 30 feet
Components: V, S (Verbal and Somatic)
Duration: 1 minute
School: Conjuration
Attack/Save: None
Damage/Effect: Utility
Classes: Bard, Sorcerer, Warlock, Wizard
Description:
You create a spectral, floating hand at a point you choose within range. The hand lasts for the duration or until you dismiss it as an action. The hand vanishes if it is ever more than 30 feet away from you or if you cast this spell again.

You can use your action to control the hand. You can use the hand to manipulate an object, open an unlocked door or container, stow or retrieve an item from an open container, or pour the contents out of a vial. You can move the hand up to 30 feet each time you use it.

The hand can't attack, activate magical items, or carry more than 10 pounds.

Usage:
Mage Hand is a versatile spell used for a variety of utility purposes, from safely triggering traps from a distance to stealthily picking up objects. It's favored by adventurers for its flexibility and the creative opportunities it provides for problem-solving without putting the caster in harm's way.

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