The night lords are beings of immense power that rule from the shadows of night.  As mortals rule over the day, their undeath rules the night.  Dracula, Strahd, Vecna, and others are examples of this primeval class of beings.

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, Fog Cloud
2nd	Scorching Ray, Spiritual Weapon
3rd	Glyph of Warding, Spirit Guardians
4th	Dominate Beast, Wall of Fire
5th	Dominate Person, Planar Binding

Crimson Feast

Starting at 1st level, when you reduce a hostile creature to 0 hit points, you gain temporary hit points equal to your Charisma modifier + your warlock level (minimum of 1). 

Dark Metamorphosis

Starting at level 1,  you age at a slower rate. For every 10 years that pass, your body ages only 1 year, and you are immune to being magically aged. Also gain proficiency in martial weapons.

Additionally, at level 6, you can hold your breath indefinitely, and you don’t require sleep, although you still require rest to reduce exhaustion or benefit from finishing short and long rests.

Blood Magic

At level 6, Your blood is filled with the supernatural magic of your patron.  You may cast your warlock spells by expending hit dice instead of using pact magic slots.

One hit dice is consumed per level of the spell cast to a maximum of half your warlock level rounded down (not to exceed 9). You take necrotic damage equal to the amount rolled on the hit dice. This damage cannot be reduced in any way.  You may not expend more hit dice than you have available when using this feature.  

This feature is usable twice per long rest.

Unholy Power

Starting at level 10, when you cast a cantrip, you may make one weapon attack with your bonus action. 

Sanguine Fury

At 14th  level, while you have temporary hit points from Crimson Feast, you gain inhuman speed in combat. When you take the Attack action or cast a cantrip, you can travel up to 15 feet before each attack to an unoccupied space you can see.

If you attack at least two different creatures with the action, you can make one additional attack with it against a third creature.  Moving using this feature does not provoke attacks of opportunity.