Magma MephitCR 3
XP 800
N Small outsider (fire)
Init +6; Senses darkvision 60 ft.; Perception +6
DEFENSE
AC 16, touch 13, flat-footed 14 (+2 Dex, +3 natural, +1 size)
hp 19 (3d10+3); fast healing 2 (works only in contact with magma or lava)
Fort +2, Ref +5, Will +3
DR 5/magic Immune fire
Weaknesses vulnerability to cold
OFFENSE
Speed 30 ft., fly 40 ft. (average)
Melee 2 claws +5 (1d3+1)
Special Attacks breath weapon (15-foot cone, effect based on type, Reflex DC 13 for half)
Spell-Like Abilities (CL 6th)
1/day—summon (level 2, 1 mephit of the same type 25%), pyrotechnics1/day
Breath Weapon (Su)
Some creatures can exhale a cone, line, or cloud of energy or other magical effects. A breath weapon attack usually deals damage and is often based on some type of energy. Breath weapons allow a Reflex save for half damage (DC 10 + 1/2 breathing creature's racial HD + breathing creature's Con modifier; the exact DC is given in the creature's descriptive text). A creature is immune to its own breath weapon unless otherwise noted. Some breath weapons allow a Fortitude save or a Will save instead of a Reflex save. Each breath weapon also includes notes on how often it can be used, even if this number is limited in times per day.
Format: breath weapon (60-ft. cone, 8d6 fire damage, Reflex DC 20 for half, usable every 1d4 rounds); Location: Special Attacks; if the breath is more complicated than damage, it also appears under Special Abilities with its own entry.
QUESTION:
How much damage does a Mephit Magma do with it's breath weapon?
The PRD (sub)entry for (Magma) Mephits states it deals 1d8 fire damage.
Did you just overlook that, with how the stats are split up between the general entry and each sub-type?
Magma Mephit (Fire)
Magma mephits are commonly found on the Plane of Fire. These mephits are dim-witted brutes.
Fast Healing: Works only in contact with magma or lava.
Immune: Fire
Weaknesses: Vulnerability to cold
Breath Weapon: A cone of fire that deals 1d8 fire damage.
Magma Form (Su): Once per hour, a magma mephit can assume the form of a pool of lava, 3 feet in diameter and 6 inches deep. While in this form, its DR increases to 20/magic and it cannot attack. It can move at a speed of 10 feet per round and can pass through small openings and cracks. Anything touching this pool takes 1d6 fire damage. A magma mephit may remain in this form for up to 10 minutes.
Spell-Like Abilities: pyrotechnics 1/day
From here.
It was farther down the page.
EDIT: NINJA!!!!!
yea I did miss it Quandary and fretgod. THANKS!