hmm, just realized that i had forgotten to post these guys.
MM2:
Vapor Rat
FREQUENCY: Rare
NO. APPEARING: 2-16
ARMOR CLASS: 6 (or special)
MOVE: 12"/ /6" (1")
HIT DICE: 2
% IN LAIR: 30%
TREASURE TYPE: See below
NO. OF ATTACK: 1
DAMAGE /A ATTACK: 1 -2 hp
SPECIAL ATTACKS: Stinking cloud
SPECIAL DEFENSES: Gaseous form
MAGIC RESISTANCE: Standard
INTELLIGENCE: Low
ALIGNMENT: Chaotic (neutral)
SIZE: S
PSIONIC ABILITY: Nil
Attack/Defense Modes: Nil/nil
LEVEL/X.P. VALUE: II/52 + 2/hp
Vapor rats appear to be nothing more than large, gray giant rats. Their habitat, however, includes areas not common to giant rats, for the-is creatures also dwell in and on the substantial cloud islands which frequently serve as the abode of cloud giants.
It is possible for vapor rats to alter the substance of their bodies and assume a gaseous form, In this condition they appear to be wisps of cloud or similar vapors, In normal solid state, vapor rats move very quickly and rapidly, are able to swim well, and are capable of burrowing rapidly through loose soil or the material of cloud islands, In their vaporous condition, they are able to direct their movement much as a ship would steer before the wind, and they are thus able to move from cloud to cloud around the sky,
Vapor rats are omnivorous, loving garbage and carrion, which is typical of a I I rats is, Wit Is They do not seek treasure, there is a possibility that the remains of t he it meals will contain some items of value. It discovered in their lair r, the re is a 25% chance for each of the following treasure types to be there: J (1 - 4), K (1 -4), L (1 -4), M (1 -4), N (1-2), C-type for gems, jewelry, and magic. If angry, hungry, or cornered, vapor rats will attack by scurrying in and delivering sharp bites. Whenever one is killed or seriously wounded, it gives off a small puff of noxious fumes This gaseous release is the equivalent of a stinking cloud spell (q.v.), but it will affect only 1 individual if within 5-8 feet of the vapor rat. The rat always directs its release at its opponent, and the gas dissipates beyond the maximum distance shown above. Thus, while it is safe to slay these monsters from a distance, they are particularly dangerous in close proximity.
Wounded or seriously threatened vapor rats will always assume gaseous form. In such state, they can only be harmed by attack forms which cause their vapors to be destroyed. Such attack forms include very hot or magical fire, lightning, and exceptionally strong winds.
MC5:
Vapor Rat
CLIMATE/TERRAIN: Any/Cloud islands
FREQUENCY: Rare
ORGANIZATION: Pack
ACTIVITY CYCLE: Any
DIET: Omnivore
INTELLIGENCE: Low (5-7)
TREASURE: Incidental
ALIGNMENT: Chaotic neutral
NO. APPEARING: 2-16
ARMOR CLASS: 6 (or special)
MOVEMENT: 12, Fl 6 (Gaseous 1)
HIT DICE: 2
THAC0: 19
NO. OF ATTACKS: 1
DAMAGE/ATTACK: 1-2
SPECIAL ATTACKS: Nil
SPECIAL DEFENSES: Stinking cloud
MAGIC RESISTANCE: Nil
SIZE: T (1' long)
MORALE: Unsteady (5-7)
XP VALUE: 35
Vapor Rats
Vapor rats appear to be nothing more than large, gray, giant rats. Their habitat, however, includes areas not common to giant rats, for these creatures also dwell in and on the substantial cloud islands that frequently serve as the abode of cloud giants and cloud dragons.
If angry, hungry, or cornered, vapor rats attack by scurrying in and delivering a sharp bite. Whenever one is killed, it gives off a small puff of noxious fumes. This gaseous release is the equivalent of the stinking cloud spell, but it affects only one individual within eight feet of the vapor rat. The rat always directs its release toward its opponent, and the gas dissipates to harmlessness beyond eight feet. Thus, while it is safe to slay these creatures at a distance, they are particularly dangerous in close proximity.
It is possible for vapor rats to alter the substance of their bodies and assume a gaseous form. In this condition they appear to be wisps of cloud or similar vapors. In their vaporous condition they are able to direct their movements much as a ship would steer before the wind, and they are thus able to move from cloud to cloud around the sky.
Wounded or seriously threatened vapor rats always assume gaseous form. In such a state, they can be harmed only by attack forms that cause their vapors to be destroyed. These include very hot or magical fire, lightning, and exceptionally strong winds (see the potion of gaseous form for more details).
some preliminary stats for the vapor rat:
Rat, Vapor
Tiny Magical Beast
Hit Dice: 2d10+X (X hp)
Initiative: +X
Speed: 30 ft (6 squares), fly 20 ft or 5 ft? (clumsy?)
Armor Class: 14 (+2 size, +X Dex, +X natural), touch 11, flat-footed 19
Base Attack/Grapple: +2/+X
Attack: Bite (1d2)
Full Attack: Bite (1d2)
Space/Reach: 2 ½ ft/2 ½ ft
Special Attacks: stinking cloud (death throes)
Special Qualities: gaseous form
Saves: Fort +X Ref +X Will +X
Abilities: Str X, Dex X, Con X, Int 6, Wis X, Cha X
Skills: X (swim)
Feats: 1
Environment: Any land and underground
Organization: Solitary or pack (2-16)
Challenge Rating: X
Treasure: (incidental)
Alignment: Always chaotic neutral
Advancement: X
Level Adjustment: +X
A vapor rat is about a foot long and weighs
COMBAT
Originally found in the first edition Monster Manual II (1983, Gary Gygax) and Monstrous Compendium MC5 - Greyhawk Appendix (1990).
Found one conversion here:
http://66.34.111.89/Eric/conversions/vaporrat.rtf