You cannot use a hand holding a shield to perform somatic components. The buckler is a specific exception which states that you can cast a spell while holding it and lose the shield bonus to AC.
Can you cast with a shield?
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Can you cast spells while holding a weapon 5E?
The rules in 5E state that you need one hand free to cast these spells. If you’re wielding a two-handed weapon then you can hold the weapon in one hand as your other hand casts the spell.
Can you cast a spell with a shield and weapon?
Casting a spell while holding a shield and weapon. This is a little “cheat” to get around the RAW that prevent you from casting somatic spells while holding a weapon and shield. Obviously the DM will decide if its okay. Get a relatively short weapon.
Can you cast a spell with both hands?
If you also take the War Caster feat, you can cast spells with the somatic component even if both hands are occupied by a weapon and a shield: You can perform the somatic components of spells even when you have weapons or a shield in one or both hands.
Can you use a shield without a war caster?
\\$\\begingroup\\$ @Adeptus Except that, by default, you wouldn’t be able to use a hand holding a shield for somatic components, even if it had the holy symbol on it. So without War Caster, you could only cast spells without Somatic components while holding weapon and shield.
Can a warcaster cast a shield spell with a focus staff?
Warcaster would only help in the OP’s edge case of being a blade lock. A wizard with a shield strapped on would not be able to cast the shield spell while holding an rod, wand, or crystal. technically, a focus staff does not qualify either, as it can be treated as a weapon but is not one in and of itself.
