Hmm i cant seem to find any stats parsay just a paragraph which tells about his attacks and description.
The creature’s form barely fits beneath the 20-foot-tall ceiling.
The aspect of Ythog-Nthtei is that of a gargantuan synthesis of a man
and some type of slug. He stands on a slimy, thick, snail-like ap
pendage that sprouts from his human chest. In one humanoid hand
he holds a long, black mace. His face is a mixture of bulbous snail
antennae and evil human features. About his form Ythog-Nthlei
wears a tong yellow robe. The King has 26 hit dice (208 hit points),
armor class -2, movement 12”.
The King attacks his opponents with his large black mace. The
weapon is +5, hits for 4-24 (+ 13 if wielded by Ythog-nhlei) points
damage, and drains one life level each time it hits. The mace can
also radiate a field of darkness if a 30-foot radius, which totally
obscures all vision, except that of the holder. The mace can animate
3-18 zombies of twice-normal strength once per week. Ythog-Nthlei
can project scintillating beams of energy from his 4 large eyes at the
rate of 1 per melee round. Each beam hits on a 4 or better and drains
one point of Strength from its target for 1 turn unless the victim makes
a saving throw. The King may also bite, inflictng 3-18 points damage,
and injecting a poison into his opponent. A poison victim must
save at -2 or fall under the control of the creature for 1-10 turns.
Ythog-Nthlei is immune to all non-magical attacks and reflects any
type of spell cast at him back to the enchantment's sander.