Herald of Curchanus

[Tinalles]

A sub-plot in my homebrew Golarian campaign based in Sevenarches requires me to stat up a herald for the long-dead god Curchanus. Here's my first stab at it.

Cocidius, former herald of Curchanus:

Cocidius (CR 15)

This fierce bald man wears little besides a kilt of linen. His complexion is a deep, rich brown, and closer inspection reveals that his skin bears whorls and lines like stained wood. His hair is made of tiny leaves, and he bears an antiquated obsidian spear.

XP 51,200
unique CG medium outsider (azata, chaotic, extraplanar, good)
Init +11; Senses darkvision 60 ft., low-light vision; Perception +26

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Defense
AC 30, touch 17, flat-footed 24 (7 Dex + 14 natural)
hp 229 (17d10+136)
Fort +17, Ref +16, Will +13
DR 10/evil and cold iron; Immune electricity, petrification; Resist cold 10, fire 10; SR 22

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Offense
Speed 60 ft., climb 30 ft.
Melee +2 obsidian romphaia +25/+20/+15/+10 (2d4+8/x3)
Space 5 ft.; Reach 5 ft. (10 ft. with romphaia)
Ranged +2 obsidian romphaia +26 (2d4+8/x3)
Special Attacks celestial stampede
Spell-Like Abilities (CL 17, concentration +20)
at will -- charm animal (DC 14), create water, purify food and drink

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Statistics
STR 23, DEX 24, CON 27, INT 16, WIS 22, CHA 17
Base Atk +17; CMB +23; CMD +40 (modifiers)
Feats Iron Will, Improved Initiative, Skill Focus (survival), Endurance, Die Hard, Combat Reflexes, Stand Still, Step Up, Following Step
Skills
+17 Acrobatics, +20 Climb, +14 Diplomacy, +26 Heal, +23 Knowledge (planes), +23 Knowledge (nature), +26 Perception, +26 Sense Motive, +27 Stealth, +32 Survival, +16 Swim

Languages Common, Celestial, Infernal, Druidic ; truespeech
Combat Gear +2 obsidian romphaia; Other Gear

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Special Abilities

Romphaia Mastery (Su) Any romphaia that Cocidius wields gains the returning weapon property, and may be used as a thrown weapon with a range increment of 60 ft (piercing damage only). In addition, Cocidius may use his romphaia to attack targets adjacent to him even though it is a reach weapon.

Alternate Form (Su) As a move action, Cocidius may increase one size category, as per enlarge person. If he throws his romphaia in this state, it retains the size increase to its damage die. As a standard action, he may assume the shape of a aurochs, as per beast shape II.

Celestial Stampede (Su) As a standard action, Cocidius may summon a stampede of celestial aurochs. He designates an area 120x30 feet through which aurochs stampede for 1d3 rounds. Any creature in the area takes 2d6+7 damage, and falls prone. A reflex save (DC 21) halves the damage and negates the prone condition.

He really needs an assortment of spell-like abilities. I've got a few in there, but they're mostly for flavor. Suggestions?

Also, for reasons which make sense inside the campaign, the soloist PC (currently a Druid 9/guardian 1) is likely to wind up fighting him.

Homebrew lore you may or may not care about:

Cocidius became greedy for power, and betrayed his master. Lamashtu certainly killed Curchanus, but it was Cocidius who lured him into the trap. Afterwards Lamashtu casually ignored Cocidius, who stole a few shreds of power from Curchanus and fled to the maelstrom, where he has been hiding from Desna's wrath ever since. Calistria recently tipped off the PC as to his whereabouts, in exchange for an unnamed favor. Defeating him is meant to be a mythic trial resulting in another mythic tier.

I don't have a very good sense for how he stacks up vis-a-vis other CR 15 critters, but I know he'd absolutely CRUSH my player's PC in a straight-up fight. Lissala's herald takes negative levels for being out of touch with her deity unless she feeds on other outsiders, so I think I'll use the same gimmick with Cocidius, only he needs to eat animals. When the time comes, I'll assign him a suitable number of negative levels to bring his power down to the tough-but-beatable range.

Thoughts? Suggestions? Tomatoes?