DOOM: The Dark Ages - DOOM Slayer Executioner Skin DLC PC CD Key

Go to Bethesda.net, click on “Log In/Sign Up” at the upper-right corner. Log into your Bethesda.net account (or create a new account if you don't already have one). Click on the Menu icon at the upper-left corner, go to the "Shop" heading and click on "Redeem Code". Enter the DOOM Slayer Guardian code you received and click on "Redeem". Launch

DOOM:
The Dark Ages, log into your Bethesda.net account and the content will be available to you in-game!