A great demon clad in blue flames that bears visage to a master thief. The Great Phantom Thief, Arsene, only makes pacts with those with a desire for power or vengeance. In exchange for your eternal servitude, Arsene grants you access to his powers. 

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	burning hands, faerie fire, hunter’s mark
2nd	blindness/deafness, scorching ray, heat metal
3rd	fireball, stinking cloud
4th	fire shield, wall of fire
5th	flame strike, hallow

Demonic Resilience

Starting at 1st level, when you reduce a hostile creature to 0 HP with fire damage, you gain temp HP equal to that amount of damage (minimum of 1).

Thieves’ Resistance

Starting at 10th level, you gain immunity to fire damage and resistance to psychic damage. Damage from magical weapons or silver weapons ignores this resistance.

Phantom Thief

Starting at 6th level, you can cast the misty step at will as a bonus action.

Phantom Torment

When you hit a creature with an attack, you can use this feature to instantly transport the target to the Fire Plane. The creature vanishes from the Material Plane until the end of your next turn.

At the end of your next turn, the target returns to the space it previously occupied, or the nearest unoccupied space. The target takes 10d10 fire damage.

You can use this feature a number of times equal to your Warlock level divided by 5 rounded down. You can’t use it again until you finish a short rest.