Formian Myrmarch

Large (Outsider (Lawful, Extraplanar)) CR 10
HP 102, hd12d8+48 AC 28 (?1 size, +4 Dex, +15 natural), touch 13, flat-fooded 24 Fort +12, Ref +12, Will +11 Speed 50 ft. (10 squares) Initiative +8 Spot , Listen
Standard attacks BAB +12, Grapple +20
Attacks
Full attack: Sting +15 melee (2d4+4 plus poison) and bite +13 melee (2d6+2); or javelin +15/+10 ranged (1d6+4)
Special Attacks/Qualities
Poison, spell-like abilities
fast healing 2, hive mind, immunity to poison, petrification, and cold, resistance to electricity 10, fire 10, and sonic 10, spell resistance 25
Skills Climb +19, Concentration +18, Diplomacy +20, Hide +15, Knowledge (any one) +18, Listen +18, Move Silently +19, Search +18, Sense Motive +18, Spot +18, Survival +3 (+5 following tracks)
Feats Dodge, Improved Initiative, Mobility, Multiattack, Spring Attack
Str 19 Con 18 Dex 18 Int 16 Wis 16 Cha 17
Alignment Always lawful neutral, Environment A lawful-aligned plane, Organisation Solitary, team (2?4), or platoon (1 plus 7?18 workers and 6?11 warriors)

A formian resembles a cross between an ant and a centaur. All formians are covered in a brownish-red carapace; size and appearance differs for each variety.
Myrmarchs are the elite of formian society. Much more than those beneath them, these creatures are individuals, with goals, desires, and creative thought.
A myrmarch is about is about 7 feet long and about 5-1/2 feet high at the front. It weighs about 1,500 pounds. Its claws are capable of fine manipulation, like human hands. Each myrmarch wears a bronze helm to signify its position (the more elaborate the helm, the more prestigious the position).
Myrmarchs speak Formian and Common.

Formians are generally aggressive, seeking to subdue all they encounter. If they perceive even the slightest threat to their hive-city or to their queen, they attack immediately and fight to the death. Any formian also attacks immediately if ordered to do so by a superior.
Hive Mind (Ex): All formians within 50 miles of their queen are in constant communication. If one is aware of a particular danger, they all are. If one in a group is not flatfooted, none of them are. No formian in a group is considered flanked unless all of them are.
Myrmarchs? claws are like hands and thus serve no combat purpose.
Myrmarchs occasionally employ javelins for ranged attacks, coated with poison from their own stingers.
They fight intelligently, aiding those under them (if any such are present) and commanding them through the hive mind. If chaotic creatures are present, however, a myrmarch is singleminded in its quest to destroy them.
A formian myrmarch?s natural weapons, as well as any weapons it wields, are treated as lawful-aligned for the purpose of overcoming damage reduction.
Poison (Ex): Injury, Fortitude DC 20, initial and secondary damage 2d6 Dex. The save DC is Consitution-based.
Spell-Like Abilities: At will?charm monster (DC 17), clairaudience/ clairvoyance, detect chaos, detect thoughts (DC 15), magic circle against chaos, greater teleport; 1/day?dictum (DC 20), order?s wrath (DC 17). Caster level 12th. The save DCs are Charisma-based.

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System Reference Document -> List of Creatures (SRD)