Unholy Bident

A bloody, flaming bident materializes in your hand, a favorite for hellish clerics and the like. The bident counts as a simple melee weapon with which you are proficient, lasting until the spell ends. The bident deals piercing damage equal to 1d8 + your spellcasting modifier, plus 2d8 fire damage, on a hit. It has the following properties:

• Bane of the Holy. Celestials, fey, and good-aligned humanoids pierced with this weapon suffer an additional 5 fire damage. This can feature can be extended to the enemies of your deity as well.
• Bloodletting. A creature that takes damage from the bident cannot regain hit points until the beginning of your next turn.
• Deadly. When you land a critical hit with the bident, you roll an additional 1d8 piercing damage. 
• Maiming. When you land a critical hit with the bident, the target suffers disadvantage on Dexterity saving throws until the end of their next turn.
• Returning. The bident can be thrown out to a range of 120/480 feet, and you can return it to your hand as a bonus action, causing it to materialize in a conflagration.

Finally, while you are holding the bident, you have resistance to fire damage.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the fire damage increases by 1d8 for every two slot levels over 4th.