Larian Studios Forums Baldur's Gate III Baldur's Gate III - Help Tips & Tricks How heavy armour and dexterity works?

I've played Neverwinter Nights 1 and 2 and Baldur's Gate 1 and 2. At first I thought this game followed the Neverwinter Nights route where you only need a 12/13 dexterity to wear heavy armour however it turns out that you can still benefit from dexterity AC with a dexterity of 17 with the gith half plate. I manage to level my cleric to level 4 and I tried setting his dexterity to 19 but didn't manage to get any increase in AC afterwards. Sorry I'm just confused how this works.