The Merchant

The Wandering Merchant is an always present patron, constantly watching those who have pledged their souls to it. It rewards them with a lifetime of service, but it's treasures always have a price. Some can pay it and some who can't faces dire consequences. 

Expanded Spell List

The Fiend lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Fiend Expanded Spells

Spell Level	Spells
1st	Command, Disguise Self
2nd	blindness/deafness, Branding Smite
3rd	Bestow Curse, [spell]Hypnotic Pattern[/spell]
4th	Blight, Phantasmal Killer
5th	Flame Strike, Dominate Person

Call of the Merchant

3rd-level Merchant feature:

The Merchant grants you a Chaos Amulet with 10 charges per short rest. You can use this amulet to roll a 2d100 Wild Magic effect. 

The Merchant also grants 3 abilities:

Wild Surge. Costing 1 amulet charge, you can roll again for another wild magic effect.

Volatile Wrath. Costing 3 amulet charges, your attacks are granted an extra (1d6) + (your charisma modifier) necrotic damage until combat ends. If a target is killed while Volatile Wrath is active, a wild magic effect will occur. When you score a critical on attack while Volatile Wrath is active, you can regain an amulet charge. Volatile Wrath gains an extra 1d6 damage at levels 6, 10 and 14.

Merchant of Darkness. Once a day, you can summon your patron's dark shadow to act as a merchant with 500 GP. It is controlled by the DM and can sell spell slots.

 

Eldritch Gift

 6th-level Merchant feature:

You are granted resistance to non-magical damage when your Chaos Amulet is attuned.

Your amulet gains an extra 1d6 charges.

Deal of Darkness

10th-Level Merchant Feature

When using the Volatile Wrath feature, you and any willing creatures in your radius of 20 feet are granted an extra (2d12) + (your charisma modifier) in temporary hit points until Volatile Wrath ends. When you or an ally lose their temporary hit points due to an attack, the attacker suffers a 2d100 Wild Magic effect.

Your Chaos Amulet now has an extra (1d6) charges.

 

Evil Incarnate

14th-level Merchant feature:

At the cost of 10 Amulet Charges, you can summon the Merchant who can grant you a 1d10 gift.

[roll]1d10[/roll]

1                          You are able to erase any event in time. 

2                          You summon the Demogorgon for half an hour to attack any nearby creature other than you.

3                          You and any creatures in a nearby radius of 60 feet are transported to the Astral Plane for 1 hour.

4                          You are gifted a random Legendary magic item of your choice.

5                          You regain all spell slots.

6                          You are able to cast the Wish spell 1d3 times.

7                          You are turned into an Ancient Gold Dragon for half an hour.

8                          You are gifted 10,000 GP.

9                           You regain all lost hit points. If you are at full HP, level up and roll again.

10                        Any creature you see in 15 feet radius has a disadvantage on saving throws against your spells.