Some spells have somatic and vocal components, that's well known.
How loud must a wizard talk? How obvious/wide should his gestures be?
Some spells that would be awesome would be fairly limited if you need to shout them
(ex: mage hand, range 30ft).
[RPG] How loud/obvious is a wizard casting a spell
dnd-5espell-componentsspellswizard
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Best Answer
There's no restriction on volume, but gestures are pretty obvious.
The Player Basic Rules p79 says:
Note that volume is not listed as important. The wizard must speak loudly enough to clearly enunciate her mystic words; a low voice would work, but a whisper might not be clear enough. Gestures are either forceful or intricate, which would be pretty obvious if visible.
A Dexterity check using the Stealth or Sleight of Hand skills is the way to go if you want to speak clearly but quietly or if you want to hide forceful or intricate gestures. If the wizard doesn't care if anyone notices, don't bother with a check; nearby people notice, as appropriate to the story. If the wizard does care, she should make a check with the normal rules.