Lavabriar (CR 2)

Medium Plant (Fire)
Alignment: Always neutral
Initiative: +3 (Dex); Senses: low-light vision and tremorsense 60 ft.

AC: 14 (+3 Dex, +1 natural), touch 13, flat-footed 11
Hit Dice: 2d8+12 (21 hp)
Fort +9, Ref +3, Will -4
Speed: 5 ft.
Space: 5 ft./5 ft.
Base Attack +1; Grapple -2
Attack: Tendril +4 melee (1d6-3) or lava spurt +4 ranged touch (2d6 fire)
Full Attack: 4 tendrils +4 melee (1d6-3) or lava spurt +4 ranged touch (2d6 fire)
Damage: -
Special Attacks/Actions: Lava spurt
Abilities: Str 4, Dex 16, Con 22, Int -, Wis 2, Cha 1
Special Qualities: Immunity to fire, plant traits, vulnerability to cold
Feats: Weapon Finesse[B]
Skills: -
Advancement: 3-6 HD (Medium)
Climate/Terrain: Warm mountains (volcanoes)
Organization: Solitary, pair, patch (3-4), or grove (5-12)
Treasure/Possessions: 1/10th coins; 50% goods; 50% items (no flammable objects)

Source: Web

Lava Spurt (Ex): Once per minute, a lavabriar can expel a gout of lava from its flower. The lavabriar makes a ranged touch attack (attack bonus +4) against any target within 60 feet. A successful hit deals 2d6 points of fire damage, and those hit take an additional 1d6 points of automatic fire damage on the next round unless the lava is scraped off (a full-round action).

The lavabriar is an unintelligent plant, and unlike many other dangerous plant creatures, it does not prey on living flesh. It is nevertheless a dangerous creature, for it has developed a highly effective way to defend itself. When the plant senses intruders, it lashes out with its tendrils and sprays lava at anything it perceives as a threat.

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.