FREQUENCY: Very rare ([Cold Civilized Plains], [Cold Civilized Desert]), ([Cold Wilderness Plains], [Cold Wilderness Desert])
FREQUENCY: Very rare ([Temperate Civilized Plains], [Temperate Civilized Desert])
FREQUENCY: Very rare ([Temperate Wilderness Plains], [Temperate Wilderness Desert])
FREQUENCY: Very rare ([Tropical Civilized Plains], [Tropical Civilized Desert])
FREQUENCY: Very rare ([Tropical Wilderness Plains])
FREQUENCY: Very rare ([Dungeon Level II])
 

NO. APPEARING: 1-8
ARMOR CLASS: 0
MOVE: 15"
HIT DICE: 2+2 ~ 16
% IN LAIR: Nil
TREASURE TYPE: Nil
NO. OF ATTACKS: 1
DAMAGE/ATTACK: See below
SPECIAL ATTACKS: Nil
SPECIAL DEFENSES: Nil
INTELLIGENCE: Non-
ALIGNMENT: Chaotic neutral
SIZE: Variable
LEVEL/X.P. VALUE: II | 50 + 3

SAVES: 13.14.15.16.16

The vortex appears as a {whirlwind} -- 4" high, 1" base diameter and 3" diameter top
(though larger ones are believed to exist on the Nemental Plane of Air).
It appears to be free willed and cannot be summoned.
The physical form of the vortex is a small sphere about thesize of a grapefruit which bobs and dodges about in the centre of the {whirlwind}.
Its small size and its {SPEED}{SPEED} of movement make it difficult
to hit; thus its high AC value.

Damage/Attack: If a character is 'hit' by the vortex, he suffers no immed. damage but is caught in the whirling cone of air and starts to spin.
Thereafter he can only be released when the vortex is killed and he will take 1-3 HP of damage per round as a result of the spin.
Additionally, there is a 5% cumulative chance per melee round of a spinning victim being killed by a particularly violent aircurrent.

A single vortex is only large enough to accommodate one victim of
human size, though it could contain two smaller creatures simultaneously.
A victim trapped inside the vortex cannot hit the being's
sphere - only those who are not trapped may do so.
 

by Simon Muth