Blade Priest

Sign of Ill Omen. You can cast bestow curse once using a warlock spell-slot. You can’t do so again until you finish a long rest.

Thirsting Blade. You can attack with your pact weapon twice, instead of once, whenever you take the Attack action on your turn.

Fiendish Vigour. You can cast false life on yourself at will as a 1st-level spell, without expending a spell slot or material components.

Beguiling Influence. You gain proficiency in the Deception and Persuasion skills.

Pact of the Blade. Bonded to a +2 longsword

Spellcasting. The Blade Priest is a 7th-level spellcaster. Its spell-casting ability is Charisma (spell save DC 15, +7 to hit with spell attacks). The Blade Priest has following warlock spells prepared:
Cantrips (at will): blade ward, eldritch blast, minor illusion
4th level (3):  Fireball, Wall of Fire, Hellish Rebuke, Hex, Witch Bolt, Dimension Door, Banishment, Counter-Spell, Invisibility, 

Multiattack. The Blade Priest makes two attacks, one with the long sword, one with the dagger.

+2 Longsword. Melee Weapon Attack: +8 to hit, reach 5 ft. Hit: 11 (1d8 + 5) slashing damage. 

Dagger of Letting. Melee Weapon Attack: +6 to hit, reach 5 ft. Hit: 11 (1d4 + 3) piercing damage. (The target takes 1d4 piercing for the next 5 turns unless they regain any hit points.)

Action Ranged Attack. RangedWeapon Attack: +# to hit, range #/# ft., # target. Hit: # (#d# + #) [damage type] damage.