FREQUENCY: Very rare
FREQUENCY: Very rare ([Dungeon Level IX])
FREQUENCY: Rare ([Astral Plane])

NO. APPEARING: 1-2
ARMOR CLASS: 1
MOVE: 12"
HIT DICE: 10+6
% IN LAIR: 20%
TREASURE TYPE: Special
NO. OF ATTACKS: 3 or 2
DAMAGE/ATTACK: 2-16/4-10/4-10 or two sword attacks at 1-8 plus bonuses
SPECIAL ATTACKS: [SB]
SPECIAL DEFENSES: +1 or better weapon to hit; see below
MAGIC RESISTANCE: 55% and see below
INTELLIGENCE: High
ALIGNMENT: Chaotic neutral
SIZE: M (6' high)
PSIONIC ABILITY: 160
    Attack/Defense Modes: A, C, D | F, G, H
LEVEL/X.P. VALUE: IX | 6,200 + 16

These creatures are the most feared non-master slaadi, being the ones
most often sent to the Prime Material Plane as Executioners of their
masters’ will. They appear in normal form as relatively small slaadi,
a uniform light grey in colour. They will more normally visit the
Prime Material Plane, however, as humans (with charisma at least 12).
They have 18(00) strength.

When fighting in slaad form, the executioners use their two claws for
4-10 hit points of damage each and a bite for 2-16 hit points of
damage. In human form they attack twice per round with a sword -
usually (75%) a +2 magical sword but sometimes (25%) a more
powerful magical weapon such as a sword of sharpness. When on the
Prime Material Plane, the executioners usually wear no armour, preferring
instead light clothing. They will usually carry treasure - one
or two powerful magical items with a pouch of gold or platinum.

Once per melee round they may use one of the following powers:
cause fear, cause darkness (15’ radius or less, at will), know alignment,
in fravision 60: create an illusion, flame strike, wind walk, shape
change (slaad/man), invisibility, generate a ball of lightning
(8d6+6 damage per ball). Once per day they can use a symbol ofpain
or fear and power word: blind. Given the time and the equipment,
they can enchant an item. They may also, once per day, attempt to
gate in 1-3 more grey slaad with a 60% chance of the gate opening.

Grey slaadi may travel the planes at will and are unaffected by cold or
disintegration spells.
 

by Charles Stross