Nimble Fighter (5e Feat)
From D&D Wiki
Prerequisites: Dexterity of 13 or higher
This Passive Feat can not take effect if you are encumbered. You can move through occupied spaces (but not end your turn on them) and take less damage equal to your Dexterity bonus (E. If you have dexterity of 18 (+4) and suffer 6 damage, you only take 2 damage).