Here's the big guy...
GRAND ABOLETH
FREQUENCY: Unique
NO. APPEARING: 1
ARMOR CLASS: 0
MOVE: 3“//24"
HIT DICE: 40 (182 hp)
% IN LAIR: 100%
TREASURE TYPE: H (x2), R, S, T (x2), V
NO. OF ATTACKS: 4
DAMAGE/ATTACK: 5-30 (x4)
SPECIAL ATTACKS: See below
SPECIAL DEFENSES: See below
MAGIC RESISTANCE: Standard
INTELLIGENCE: Godlike
ALIGNMENT: Lawful evil
SIZE: L
PSIONIC ABILITY: 370
Attack/Defense Modes: All/all
LEVEL/XP VALUE: X/32,000
The grand aboleth is quite simply the largest aboleth in existence on a particular world. It is not only incredibly huge (about 70’ long with ten 30’-long tentacles), but also vastly intelligent. It has a telepathic link with every ruler aboleth on its world (within a range of 10,000 miles), effectively giving it complete knowledge of all that goes on within its empire. It can attack physically with great effect and exudes slime in a 20’ radius. Its psionic powers are unmatched by any other aboleth, and it has the disciplines of body equilibrium, cell adjustment, detection of good or evil, detection of magic, ESP, levitation, mind over body, astral projection, body control, energy control, and probability travel, all performed at the 25th level of mastery. The grand aboleth also has enslavement powers equal to those of a greater aboleth and can create very effective illusions (save at -4). This monster dwells in a vast chamber in the midst of the largest aboleth city, which floats on the lowest portion of the worlds underground seas.
The illusion powers of the grand aboleth are equivalent to the spell capability of an 18th-level illusionist. The choice of the monster’s spells are left to the DM to decide. The grand aboleth may also generate veil spells at will, one per round.
Originally appeared in Dragon Magazine #131 (1988).
Upthread, we decided upon Colossal, Int 33, Wis 31, Cha 31.