Hi,

I generated a set of spoiler files using "wizard mode", and the
monster information is not correct.

For example, the generated file contains:
[U] Sangahyando of Umbar  (Light Umber 'p')
=== Num:273  Lev:24  Rar:2  Spd:+0  Hp:800  Ac:96  Exp:400
A Black Númenorean with a blacker heart.
This evil creature is normally found at depths of 1200 feet (level 24),
and moves at normal speed.  He may carry one or two objects or treasures.
He resists bright light and rock remover, and does not resist acid,
lightning, fire, cold, poison, water, nether, plasma, nexus, or
disenchantment.  He takes a while to see intruders, which he may notice
from 250 feet.  He may appear with other monsters.  He may cast spells
which confuse or slow; 1 time in 4.  He can hit to attack with damage 4d6,
hit to attack with damage 4d6, hit to attack with damage 4d6, and hit to
attack with damage 4d6.

Yet I have encountered this unique, and Sangahyando does resist (at
least) lightning.

Regards,

Matthew