No.
In 5e, no armour affects your ability to cast spells of any kind (Aside from Druids and Metal armour... But that doesn't exist in BG3)
The only penalty associated with wearing armour you are proficient in, is the Stealth penalty found on Heavy Armour and some pieces of Medium Armour (It will state on it that it will provide Disadvantage on Stealth checks).
So you are completely fine with having say a Wizard run around in full plate armour and casting spells all day (In fact, this is actually a pretty strong build when set up correctly)
Last edited by Taril; 24/01/25 01:03 PM.
