Brutish Durability

Assault Specialist: 10th, 13th, and 17th level Once per round, you can roll a d8 and add the die to a saving throw you make. If applying this bonus to a death saving throw increases the total to 20 or higher, you gain the benefits of rolling a 20 on the d20. This die increases to a d10 at 13th level and a d12 at 17th level.

Granted by Assault Specialist at 13th level.