Prerequisite: Requires barbarian class, and a strength score of 13+
If your player puts their hand in a mimic chest, or walks on a poisonous plant, without realising it, they do not take any damage. But, the moment they realise what has happened, continue play normally (eg.If another player points out that they just walked on a poisonous plant, or they point out you pulled a tongue out of the treasure chest).This feat would be best used on a barbarian, or a half orc creature. In Sci-Fi styled campaigns, characters with this feat can easily breathe on other planets, unless they see someone else gasping for air.