Unlike most other infernals, Erinyes appear attractive to humans, resembling very comely women or men. They can change their apparent gender at will. In their normal form they have wings, but they can cause these wings to disappear or reappear at will. An erinyes is taller and heavier than an average human, though not beyond the realm of regular variation. Besides the language of infernals and the Common tongue, erinyes also speak Dragon.

Erinyes are normally armed with magical venomous daggers which drip a caustic substance that causes wounds made by the daggers to be very painful; anyone hit by this dagger attack must save vs. Poison or become unconscious for 1d6 rounds. Each is also armed with a rope of entanglement which can lash forward 20 feet or upward 10 feet to entangle up to 2d4 man-sized victims selected by the erinyes (adjust numbers for larger or smaller opponents as needed). The rope can be hit only on a 20 or higher, and is destroyed when it suffers 20 or more points of damage. Finally, erinyes may be armed with bows which are built for their great strength (which can be drawn only by characters with at least 18 Strength) and a quiver of 66 arrows that ignite when fired. Arrows fired from this bow do 1d8 points of damage on a hit, and these arrows inflict an additional 1d8 points of fire damage. If an erinyes runs out of arrows it can use any longbow arrows, but loses the bonus fire damage.

Like other infernals, erinyes can only be damaged by magical weapons.

Though erinyes are very strong, they do not generally receive bonuses to attack rolls or damage from their Strength. However, they are able to use weapons made for larger creatures such as ogres without difficulty. They will, of course, prefer to use their own weapons whenever possible.