New Monster: Ghoulfish

I recently completed #inktober2020, and for several of the images created some things that could be new monsters. This was the day 1 prompt — fish.

A ghoulfish is a bulky thing, measuring about 6' long from tip of lip to end of tail. It is a ghostly, glowing white, making the area around it seem darker. They are solitary travelers, Abyssal natives found both in Hell and the Abyss as they move up and down the river Styx, occasionally emerging in the Astral Sea. They are constantly swimming, always on the hunt to consume the life force of living creatures.  The bite of a ghoulfish does 2d6 hit points of damage and drains 1 level from the victim (no saving throw permitted). The loss is permanent but may be regained through continued experience acquisition.  Ghoulfish are not affected by sleep, charm, or hold spells, nor are they affected by mind reading or controlling effects. Furthermore, a +1 or better weapon is required "to hit" a ghoulfish.  Should a resurrection attempt be made on a humanoid creature killed by a ghoulfish, the body of the deceased must be completely submerged when the attempt is made. If successful, the character must be immediately pulled out from the water/liquid, and a successful save vs. death throw made for the now-living character to avoide immediately dying again from drowning. If another character assists on the save (only 1 character may assist), the assisting character's Intelligence bonus applies to the saving throw vs. drowning (e.g., if a character with a +3 Intelligence bonus assists, the character gets a +3 bonus on the save vs. death to avoid the drowning).

Oe/1E STATS FREQUENCY: Very rare NO. APPEARING: 1 ARMOR CLASS: 2 MOVE: /6" HIT DICE: 7+1 % IN LAIR: 0 TREASURE TYPE: Nil NO. OF ATTACKS: 1 DAMAGE/ATTACK: See below SPECIAL ATTACKS: Energy drain SPECIAL DEFENSES: +1 or better     weapon "to hit" MAGIC RESISTANCE: Standard INTELLIGENCE: Animal  ALIGNMENT: Chaotic neutral  SIZE: M (6' long) PSIONIC ABILITY: Nil Attack/Defense Modes: Nil BX STATS ARMOR CLASS: 2† HIT DICE: 7+1** MOVE: /60'(20') ATTACKS: 1 bite DAMAGE: 2-12 + special NO. APPEARING: 1 SAVE AS: Fighter:7 MORALE: 10 TREASURE TYPE: Nil ALIGNMENT: Chaotic