A Sample Monster (That Is Totally Fucking Metal)

Erinyes: (LE Evil Outsider)
HD: 9+9
Armour: 19
Move: 30', fly 90'
Attack: 2x Weapon +4 (poison, paralysis for 1d4 hours)
Saving Throw:  (Fort/Reflex/Will) 10/6/8
Special Abilities: Covenant of Destruction, Hair Rope, Immunity (charm, fear, fire, poison), Shape Weapon
Spells: (at will) Fear, Hold Monster, Teleport Without Error, (once a day) Summon (50%, 1 erinyes)
Intelligence: Superior
Treasure: +1 magical weapon

The Erinyes are the enforcers of Hell's will, fallen angels sent screaming back into the world to track down those who attempt to renege on oaths sworn in the name of their fell masters, of those who pledge their souls but attempt to win them back. They are strong, possessing the equivalent of 18 Strength. They take the form of beautiful but terrible men and women and usually forgo all clothing , save for elaborate scars marking their previous victims as well as the inevitable gore that accompanies their dark deeds.

They have the ability to mark one soul as their chosen quarry, invoking a Covenent of Destruction, being able to track that soul across planes if need be, gaining the ability to plane shift as needed to reach their target. They wield ropes made out of their own hair which entangle foes, either to simply bind them or lift them aloft to their deaths. An erinyes can transform any enchanted weapon into any other variety of enchanted weapon, but generally favor bows and longswords. Their paralytic poison stops movement, but does not prevent sensation, allowing them to draw out the deaths of their charges as they please.
 
An Erinyes is vicious but cunning as well and can occasionally be bargained with, particularly if there is the promise of more slaughter to be had.