Unarmored Metallization

You have via wish made your body fully metal! Your able to control how metallic you look at any given point. More importantly, you become quite literally as tough as steel! Your AC becomes 16+ half your proficiency modifier rounded up. Due to your metallic form, you have disadvantage on Dexterity (Stealth) checks. You no longer benefit from Armor (magic or not), but can still use a shield and gain its benefits.

For the purposes of class features, feats, etc, you are not considered armored.

Due to how feats work in DnD beyond, the player will need to manually set their AC when appropriate