Adamantine Armor

Armor (medium or heavy, but not hide), uncommon · 2014 rules, SRD 5.1

Any critical hit against you becomes a normal hit.

Also in the 2024 rules (SRD 5.2).

This page includes material from the System Reference Document 5.1 ("SRD 5.1") by Wizards of the Coast LLC, licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/legalcode).