You employ mutagenic toxins created to enhance your abilities. When you finish a rest, you can drink one such toxin to gain its effects, which last until you finish your next rest. These effects include a +1 bonus to one trait of your choice, a −1 penalty to a different trait of your choice, and your choice of one of the following benefits:

• Celerity. If you are Restrained or Vulnerable, you can mark a Stress to end the condition on yourself.

• Durable. Your Armor Score increases by 2.

• Hunter’s Senses. You have advantage on any action roll you make to track a creature, and you can see in complete darkness.

When you choose a mutagen benefit, your options also include the following:

• Nerves of Steel. Whenever you must mark a Stress, you can spend 2 Hope instead.

• Rapidity. Your Evasion increases by 1.

• Ironskin. Your Severe damage threshold increases by a number equal to your Proficiency.

You can choose two mutagen benefits instead of one. If you do, mark a Hit Point that can’t be cleared until you finish your next rest.

The trait bonus and penalty you get from your Mutagens feature changes to +2 and −2, respectively. When you choose a mutagen benefit, your options also include the following:

• Aetherblood. Within your line of sight, you can see creatures and objects that are invisible, and visual illusions appear transparent to you. If a creature or an object within your line of sight has been transformed by magic, you can see its true form.

• Fury. When you make an attack roll, you can mark a Stress to gain a bonus to the roll equal to your Proficiency.

• Steelflesh. Your Major damage threshold gains a bonus equal to your Proficiency.