FREQUENCY: Very rare ([Cold Freshwater Depths])
FREQUENCY: Very rare ([Cold Saltwater Depths])

FREQUENCY: Very rare ([Temperate Freshwater Depths])
FREQUENCY: Very rare ([Temperate Saltwater Depths])

FREQUENCY: Very rare ([Tropical Freshwater Depths])
FREQUENCY: Very rare ([Tropical Saltwater Depths])

NO. APPEARING: 1
ARMOR CLASS: 3
MOVE: 18"
HIT DICE: 7
%IN LAIR: 100%
TREASURE TYPE: [G]
NO. OFATTACKS: 1 ~ 13
DAMAGE/ATTACK: 1-10
SPECIAL ATTACKS: Hypnosis, charm
SPECIAL DEFENSES: Spell reflection
MAGIC RESISTANCE: See below
INTELLIGENCE: Exceptional
ALIGNMENT: Chaotic evil
SIZE: M
LEVEL/X.P. VALUE: VII | 1050 + 8

The morkoth, or morlock, is a dim, shadowy monster often referred to as
the "wraith of the deep." It is possibly humanoid, but reports vary.
It inhabits dark, deep waters.

Lair: The lair of a morkoth is a series of spiraling tunnels,
and at the nexus of these passages lurks the morkoth.

Hynosis: Any creature passing over one of these tunnels is drawn towards it hypnotically,
far the tunnels form a pattern which is hypnotic.

Charm: When a victim is within the passages he approaches the morkoth without realizing it and will be charmed by a spell from the monster unless a saving throw at -4 on the die is made.
The charmed victim will then be devoured at the morkoth's leisure.

The tunnels of a morkoth are constructed so as to prevent large creatures from entering.
There are typically 6 tunnels in a lair. Note that should any victim come closer than 6", the hypnotic effect is broken.

Combat: The morkoth attacks by biting.
A charmed creature will suffer this attack without knowledge,
and thus enable the monster to consume it.

Spell Reflection: Spell attacks of any sort are reflected by the morkoth,
affecting the caster and possibly affecting others nearby also,
if the spell is one with an AREA effect.
    Exception: However, if a dispel magic is cast simultaneously,
    the morkoth will beunable to reflect the spell and there is a 50% chance that the magic will affect the creature,
    although even then the morkoth is allowed a saving throw.

<there is a map of a morkoth lair in the FR module FRQ2 Hordes of Dragonspear>

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The morkoth isn't mine, so I can't comment.