https://youtu.be/tC47xDSLHis
Check my profile for other builds made by me.
Credential's: 450+ hours in Nightmare running various builds.
This is the one I primarily use when solo running, or being the lead runner in a group. Double grenade pouch into 3x grenades to kill mutations, blow open doors in an instant, or clear the way so you don't have to backtrack as hard in a crowded area. Experienced EMT is one often overlooked card for speedsters but +20% health overrides trauma (if your hp is higher than your standard maximum hp when entering the safehouse all trauma is removed, effectively healing you) and gives your pills an extra +20% effectiveness essentially. Fire in the hole is the same as experienced EMT in the way you are keeping your HP as high as possible through temp health to prevent trauma damage. Additionally the movement speed buff is the largest in the game though shortest duration. It incentivizes you to use grenades as a panic button to clear a hoard or tallboy and zoom past before more spawn in. Stimulants before Medical expert because duration of movement speed buff but both combined is really strong and generic use speed for if you have to use something. In most cases you want another person on your team dedicated to use speed.