Another random critter: Gultheins (named after the Wyrish Royal Family; the boar is their emblem.). Your basic great nature spirit: paragon fully advanced dire boar + monster of legend + quasi-deity; Narh is constructed pretty much the same way. Switched out paragon SLAs and Ferocity special ability for additional Monster of Legend ability (deathless frenzy). Allies of Nwm and Mesikammi.
Gulthein
Huge Outsider (Augmented Animal, Green, Native)
Initiative: +13
Hit Dice: 21d8+378 plus 252 (798hp)
Speed: 450 ft.
Armor Class: 64 (-2 size, +8 deflection, +9 Dex, +1 dodge, +12 insight, +12 luck, +14 natural; flat-footed 54, touch 50)
Base Attack/Grapple: +15/+50
Attack: Gore +67 melee (2d6+60/18-20x3)
Full Attack: 2 gores +67 melee (2d6+60/18-20x3)
Space/Reach: 15ft./10ft.
Special Attacks: Augmented critical
Special Qualities: Deathless frenzy, DR 10/epic, fast healing 20, fire and cold resistance 10, Immunities (ability damage, ability drain, energy drain, mind-affecting effects, petrification, polymorph), hasted, SR 45
Saves: Fort +43 Ref +34 Will +30
Abilities: Str 64 Dex 29 Con 46 Int 19 Wis 30 Cha 27
Skills: Jump +195, Listen +34, Search +16, Sense Motive +22, Spot +34, Survival +22
Feats: Ability Focus (Frightful Presence), Awesome Blow, Cleave, Great Cleave, Devastating Critical (Gore), Improved Critical (gore), Improved Initiative, Multiattack, Overwhelming Critical (gore), Weapon Focus (gore)
Environment: Temperate foests
Organization: Solitary or herd (5-8)
Challenge Rating: 28
These enormous boars, which bristle with raw power, are one of the many manifestations of Uedii's ire. They move with great speed; whilst capable of formulating sophisticated plans, a Gulthein is aware that direct, overwhelming assault is its most effective weapon.
Gultheins understand Common and Sylvan, but are incapable of speech. They are immortal.
Combat
Gultheins understand that arcane spellcasters are often the most vulnerable to its Devastating Critical attack, and will target them first in preference to other character classes if it recognizes them.
Deathless Frenzy (Ex): If reduced to below 0 hit points, the Gulthein will continue fighting for a further 21 rounds before it expires.
Devastating Critical: Cretaures who suffer a critical hit from the Gulthein must make Fortitude saving throws (DC 47) or die.
Frightful Presence (Ex): When the Gulthein snorts (a free action), the ground trembles. Creatures with 20 or fewer Hit Dice within 20 ft. must make Will saving throws (DC 30) or become shaken until the opponent is out of range. A creature which saves successfully is immune to the Gulthein's ability for 24 hours.
Hasted (Su): The Gulthein acts as if hasted at all times; its stat bock reflects this.