An extract from the stat block:
ARMOR CLASS: 0
MOVE: 6”
HIT DICE: 13 (104 hit points)
TREASURE TYPE: 100% H, S, T, U
NO. OF ATTACKS: 3
DAMAGE/ATTACK: 2–12/3–18/3–18
SPECIAL ATTACKS: Magic use
SPECIAL DEFENSES: Magic weapons to hit; not affected
by charm, cold, electricity or fire
INTELLIGENCE: Genius
ALIGNMENT: Chaotic evil
SIZE: M
PSIONIC ABILITY: 250
Attack/Defense Modes: All
She knows every M-U spell and can cast 2 spells of each level up to 6th.
I think Rodney Thompson forgot that 1e Liches have to be M-Us of 18th level or higher.
The base MM Lich has 11 actual hit dice because that's how many dice an M-U gets, but theirs turn from d4s to d8s, then they get the 1 point per M-U level above 11th AIR.I think if I were going to use this I'd let her keep her 13 actual hit dice but she'd fight, save and spellcast as a 21st level M-U, which in 1e is a perfectly credible foe for eg 12th level PCs. It's only in 3e that you needed to keep enemy PC-type abilities close to PC-level.
