Order of The Fiend

Since the beginning of the Blood War, both demons and devils alike have used their abilities to corrupt the inhabitants of the different planes.  Through this corruption, there have been creatures like gnolls, tieflings, and various others to aid in the battle.  Sometimes, the blood is corrupted as a poison, and used to manipulate the essence of others.  Those changed in this way have the ability to transform into semi-fiends to battle the opposing armies.  

Slayer

You gain a critical hit on a 19 or 20.

Metamorphosis

Upon choosing this archetype at 3rd level, you begin to learn to control the fiendish curse that now flows in your veins. As a bonus action, you can transform into your fiend form for up to 1 hour. You can speak, use equipment, and wear armor in this form. You can revert to your normal form earlier as a bonus action. You automatically revert to your normal form if you fall unconscious, drop to 0 hit points, or die. 

Once you use this feature, you must finish a short or long rest before you can use it again.

In the Character Builder, set the option for Metamorphosis to Fiend Form to activate the bonuses for that form on the character sheet.

Fiend Form

Selecting this option has updated the character sheet with the features of your Fiend Form.

Metamorphosis Features

While you are transformed, you gain the following features:

Fiendish Vigor. You gain resistance to fire damage, as well as bludgeoning, piercing, and slashing damage from non magical attacks.

Predatory Strikes. You can apply your Crimson Rite feature to your unarmed strikes as a single weapon. You can use Dexterity instead of Strength for the attack and damage rolls of your unarmed strikes. When you use the Attack action with an unarmed strike, you can make one unarmed strike as a bonus action.

Your unarmed strikes deal 1d6 slashing damage. The damage increases to 1d8 at 11th level.

Devils Sight. You gain darkvision up to 60ft, and magical darkness does not impede your darkvision.  If you have a racial trait that gives you darkvision greater than 60ft, then you are granted this feature for your racial darkvision.

Magical Resistance. You gain advantage on saving throws against magical effects.

Strength Increase. You can add a +2 to all strength based checks (attacks, damage rolls, strength checks, and strength saving throws) when in your fiend form. 

Devil's Sight

You gain darkvision up to 60ft, and magical darkness does not impede your darkvision.  If you have a racial trait that gives you darkvision greater than 60ft, then you are granted this feature for your racial darkvision.

Fiendish Vigor

You gain resistance to fire damage, as well as bludgeoning, piercing and slashing damage from non magical attacks.

Magical Resistance

You gain advantage on saving throws against magical effects.

 

Strength Increase

You can add a +2 to all strength based checks (attacks, damage rolls, strength checks, and strength saving throws) when in your fiend form. 

Stalker

At 7th level, your speed increases by 10 feet. You also can add 10 feet to your long jump distance and 3 feet to your high jump distance. In addition, your Fiend Form gains the Improved Predatory Strikes feature.

Improved Predatory Strikes. You gain a +1 bonus to attack rolls made with your unarmed strikes. This bonus increases by 1 at 11th level (+2) and 18th level (+3). In addition, when you have an active Crimson Rite while in your hybrid form, your unarmed strikes are considered magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Advanced Transformation

Starting at 11th level, you learn to unleash and control more of the fiend within. You can use your Metamorphosis feature twice, regaining all expended uses when you finish a short or long rest. In addition, your hybrid form gains the Fiendish Vitality, and Avernus Toughness feature.

Fiendish Vitality. When you activate your Metamorphosis feature, you regain temp HP equal to 5 times your proficiency bonus. 

Avernus Toughness. You are immune to critical hits. 

Hell Wings. You gain a flying speed equal to your movement speed.

Avernus Toughness

You are immune to critical hits

Fiendish Vitality

When you activate your Metamorphosis, you gain temp HP equal to 5 times your proficiency bonus.

Hell Wings

You gain a flying speed equal to your movement speed.

Curse of the Blinded

As a bonus action, you can magically hide yourself, and up to a number of friendly creatures equal to either your INT or WIS modifier (your choice). Until the end of your next turn, you and the friendly creatures are considered invisible to your target.  

Amplify.  When amplified, this effect also overcomes truesight, as well as other special senses, and lasts for one minute.  The target can use an action to make a CON saving throw to end this effect. 

Metamorphosis Mastery

At 18th level, you have wrestled your inner predator and mastered it. You can use your Hybrid Transformation feature an unlimited number of times, and your hybrid form can now last indefinitely.

You also gain the ability of the Wrath of the Lower Planes ability.