Dungeons & Dragons 5e Element 133 Class Feature: Survivor's Endurance

Your difficult environment has made you hardy. You may increase your max Hit Points by 5 x your Tier when you take this feature. Additionally, whenever you gain a new Tier you may add 2d12 + 8 + CON mod hit points instead of what you would normally roll.

Grounded

You may spend your action to center yourself during combat. You may spend up to two hit dice and regain hit points equal to the roll of the dice. These dice will be spent and may only be used again after a long rest.