In the Dungeons & Dragons multiverse, almost every magic spell requires the caster to be able to speak and move their hands. There are some spells that can be cast without the somatic component, allowing the caster to still use magic, even while bound by restraints. D&D's Weave of Magic allows casters to access spells, but they must follow strict rules in order to bring their magic into reality.
The spells listed in the D&D Player's Handbook have a Components section, which can feature the letters V, S, and M. The V stands for verbal, which means the caster needs to be able to talk in order to use their spells. If the caster has been gagged or is under the effects of a silence spell, then they cannot use spells with a verbal component. The S stands for somatic, which means the caster needs to be able to use at least one hand to perform the gestures necessary for the spell. If the caster is bound or paralyzed, then they cannot use spells with a somatic component. The M stands for material, which means the caster needs an item to cast the spell, such as a piece of cork for the water walk spell. Most DMs are fine with assuming the caster has any components needed to hand, unless they have had their possessions taken away, or if they cost money, such as D&D's resurrection spell costing 1000 GP in diamonds.
Related: D&D: Fictional Languages You Can Use In A Campaign
The spellcasters in D&D can be incredibly powerful, but these restrictions mean that they have huge weaknesses that can be exploited. There are some exceptions to this, such as the sorcerer's Subtle Spell Metamagic ability, which lets them ignore verbal and somatic components, but it costs a Sorcery Point, and they have a finite number of these. If a caster does
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