Ash Rat (CR 1)

Small Magical Beast (Fire)
Alignment: Always chaotic neutral
Initiative: +8 (Dex); Senses: darkvision 60 ft. and low-light vision

AC: 16 (+1 size, +4 Dex, +1 natural), touch 15, flat-footed 12
Hit Dice: 1d10 (5 hp)
Fort +2, Ref +6, Will +1
Speed: 40 ft., climb 20 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple -5
Attack: Bite +0 melee, or flame spit +6 ranged touch
Full Attack: Bite +0 melee, or flame spit +6 ranged touch
Damage: Bite 1d4-2, flame spit 1d4 fire
Special Attacks/Actions: Flame spit, heat
Abilities: Str 6, Dex 18, Con 11, Int 2, Wis 13, Cha 3
Special Qualities: fire heal, fire subtype, smoky hide grants concealment (20% miss)
Feats: Improved Initiative
Skills: Climb +14, Hide +9*, and Move Silently +5
Advancement: 2-3 HD (Small)
Climate/Terrain: Any warm land
Organization: Solitary, nest (10-40) or horde (41-60)
Treasure/Possessions: None

Source: Monster Manual II

Flame Spit (Su): Once per round, an ash rat can spit flames at one target up to 10 feet away. This attack deals 1d4 points of fire damage.

Heat (Ex): An ash rat's body heat deals 1d2 points of fire damage to each creature (except another ash rat) that touches it. Any flammable item in contact with an ash rat must make a successful Reflex save (DC 10) or catch fire (see Catching on Fire). When an ash rat dies, its body burns away completely in 1 round.

Fire Heal (Ex): Fire and heat heal an ash rat's wounds. For every round that the creature is exposed to flame or heat intense enough to deal at least 1 point of damage, the creature instead gains the benefit of a cure minor wounds spell (1 hit point healed). Two or more ash rats touching each other provide enough heat for fire healing.

Fire Subtype (Ex): An ash rat is immune to fire damage but takes double damage from cold unless a saving throw for half damage is allowed. In that case, the creature takes half damage on a success and double damage on a failure.

Smoky Hide (Ex): An ash rat continually sheds smoke from its body. This smoky haze is so thick that it grants the creature one-half concealment (20% miss chance) and makes hiding easier (see Skills, below). Though it is difficult to see the ash rat because of the smoke rising from its body, the smoke itself is visible, provided that the area has sufficient light by which to see it.

Skills: An ash rat uses its Dexterity modifier instead of its Strength modifier for Climb checks. *In smoky or foggy areas, an ash rat gains a +8 bonus on Hide checks.

An ash rat normally flees from combat it possible. When cornered, it fights defensively, spitting fire at those who threaten it. Its heated body is painful to the touch, which prevents prudent foes from closing.

Fire Subtype

A creature with the fire subtype has immunity to fire. It has vulnerability to cold, which means it takes half again as much (+50%) damage as normal from cold, regardless of whether a saving throw is allowed, or if the save is a success or failure.