Rimefire Eidolon (CR 9)

Medium Fey (Cold)
Alignment: Always chaotic good
Initiative: +11 (+7 Dex, +4 Improved Initiative); Senses: low-light vision, tremorsense 60 ft., Spot +18, and listen +18
Languages: Common, Auran, Aquan, and Sylvan

AC: 19*(+7 Dex, +2 natural), touch 17*, flat-footed 12* (*The eidolon gains a +2 sacred bonus to AC against evil creatures with the cold subtype.)
Hit Dice: 12d6+36 (78 hp); DR: 10/cold iron
Fort +9, Ref +15, Will +11
Speed: 30 ft., fly 120 ft. (perfect)
Space: 5 ft./5 ft.
Base Attack +6; Grapple +6
Attack: Slam +13 melee or rimefire bolt +13 ranged
Full Attack: 2 slams +13 melee or rimefire bolt +13/+8 ranged
Damage: Slams 1d4 plus 1d6 cold, rimefire bolt 3d6+6 rimefire
Special Attacks/Actions: Frost touch, rimefire bolt, spell-like abilities
Abilities: Str 10, Dex 24, Con 17, Int 15, Wis 17, Cha 22
Special Qualities: iceberg dependent, ice glide, immunity to cold, rimefire bond, vulnerability to fire
Feats: Empower Spell-like Ability (ice storm); Great Fortitude; Improved Initiative; Mark of Hleid; Weapon Finesse
Skills: Bluff +21, Concentration +18, Diplomacy +25, Disguise +6 (+8 acting), Intimidate +8, Knowledge (nature) +17, Knowledge (religion) +17, Sense Motive +18, Spot +18, Survival +3 (+5 in aboveground natural environments), and listen +18
Advancement: 13-36 HD (Medium)
Climate/Terrain: Cold aquatic
Organization: Solitary or bonded pair (rimefire eidolon plus 1 rimefire witch)
Treasure/Possessions: Standard

Source: Frostburn

Frost Touch (Su): A rimefire eidolon deals an extra 1d6 points of cold damage with each successful slam attack.

Rimefire Bolt (Su): A rimefire eidolon can hurl bolts of the burning radiance that constantly surrounds it. A rimefire bolt has a range of 100 feet, and attacks as a ranged touch attack. The bolt deals damage equal to 3d6 plus the rimefire eidolon's Charisma modifier. Half of this damage is cold damage, and half is fire damage. A rimefire eidolon may use the full attack action to make multiple attacks with rimefire bolts.

Spell-Like Abilities: At will - blur, clairaudience/clairvoyance (only within 300 yards of home iceberg), detect evil, detect magic, ice shape, ice slick, obscuring snow, see invisibility; 3/day - chill metal (DC 18), cone of cold (DC 21), ice storm, wall of ice, winter's embrace (DC 20); 1/day - entomb (DC 22), polar ray (+13 ranged touch). Caster level 12th.

Iceberg Dependent (Su): A rimefire eidolon risks death if it travels more than 300 yards from its iceberg home; if forced to do so, it takes 1d6 points of damage per round until it either dies or is allowed to return to its iceberg. As long as a rimefire eidolon is inside of or in contact with its iceberg, it can use clairaudience/clairvoyance as a spell-like ability at will, as long as the area observed is within 300 yards. Finally, a rimefire eidolon can cause its iceberg to move by concentrating; each round it maintains its concentration, the iceberg moves as it directs at a speed of 20 feet.

Ice Glide (Ex): An eidolon can glide through ice, snow, or slush as easily as a fish swims through water. Its burrowing leaves behind no tunnel or hole, and its passage does not create any ripples or other signs of its presence.

A rimefire eidolon often fights from the cover of an ice wall or snow field in much the same way that an incorporeal creature can use a wall or floor for cover. An eidolon attacking a creature outside the ice or snow in which it is hiding gains the benefit of cover.

Rimefire Bond (Su): A rimefire eidolon may forge a powerful spiritual bond with an aspiring rimefire witch. Doing so requires the rimefire eidolon to simply touch the target and will the bond to exist. Once it is forged, this bond is a permanent effect and cannot be dispelled or destroyed. If a rimefire witch or her eidolon is killed, this bond is broken. If the slain member of the bond is brought back to life within a year of death, the rimefire bond instantly reforges itself despite any physical distance between the two.

As long as the bond exists, a rimefire eidolon knows the location and condition of its bonded witch as if by the status spell. Additionally, the rimefire eidolon gains a +2 morale bonus on all saving throws against mind-affecting and death effects. This bond is powerful enough that it can extend across planar boundaries.

Tremorsense (Ex): An eidolon can automatically sense the location of anything within 60 feet that is in contact with the ground (or ice or snow on top of the ground).

Rimefire eidolons avoid melee combat, since they are rather unskilled in it. They prefer to maintain ranged superiority by virtue of their swift fly speed, and use their rimefire bolts and spell-like abilities to defend themselves.

If a rimefire eidolon has a bonded rimefire witch and it ever sustains damage or succumbs to a harmful effect, the bonded witch comes to the eidolon's aid as quickly as possible. High-level rimefire witches can use word of recall to instantaneously travel to the heart of a rimefire eidolon's iceberg, and do so without hesitation if their eidolon is ever in danger.

Cold Subtype

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