Demon bow artifact

[Kimras]

the highest ranking erinyes is going in my game she was gifted with a bow made out of a hair from nergall and made from the bone of a former archdemon what magic powers do you think such a bow should have?

[Crake]

the highest ranking erinyes is going in my game she was gifted with a bow made out of a hair from nergall and made from the bone of a former archdemon what magic powers do you think such a bow should have?

Could probably open up with unholy? Maybe give it the power to slay good outsiders with overwhelming evil (all arrows fired from it are treated as arrows of good outsider slaying)? Have it force a will save or have any neutral wielder become evil, and any good wielder die? Those hit by the arrows fired from the bow are targetted as if by a dispel good? Wielder has unholy aura? There's plenty of cool things you could throw on it

[Snowbluff]

So it says he's a bringer of disease and stuff. Arrows shot from the bow should give people diseases, as Contagion.

[Segev]

+1 Angelbane and Demonbane Composite Longbow. It should be geared specifically for this Erinyes's Strength.

Specifically, Angelbane and Demonbane are Bane for Good and Chaotic Outsiders, respectively. Notably, these Bane bonuses will stack against CG Outsiders. So, against a Good Outsider or a Chaotic Outsider, it is a total of a +3 bonus and does an extra 2d6 damage. Against a CG Outsider, it is a total of a +5 and does an extra 4d6 damage.

Now, that's a solid magic item, but hardly an artifact by itself. It's a mere +3, and while very good for this Erinyes (given her most likely sorts of foes), not necessarily all that hot for PCs if they get their hands on it.

Let's also give it a re-fluffed Wounding tag. +2 equivalent, not mechanically different, so it does 1 Con damage per hit. But it's due to disease and fever sweeping through the body of the target, not due to blood loss. Nergal is the Duke of Disease, after all.

Now, to artifact powers:

Its long use by the Erinyes has comingled her corrupting emotional essence with the powers of the Potentate of Pestilence and the terrible domineering might of the slain archdemon. It has an enhanced version of the Merciful tag which, when active, causes it to inflict a Charm Monster effect (Fort DC 23 negates) effect. This is due to the fever-induced Con-loss also causing delusions and hallucinations which make the victim see only the absolute best (in the victim's opinion) of the one who shot them.

The Calif of Contagion's hair causes any arrow fired from it not to be destroyed upon use. Indeed, the arrow retains the properties of enchantment passed to it by the bow (though it is consumed upon a second use). If placed in a container with other arrows, it will also spread its properties to them. Firing such an arrow gives the one firing it a choice, which they subconsciously sense the moment they're about to release it: they may use it, having it work exactly as it's supposed to, but they owe a single favor which the wielder of the bow may demand, and their Alignment shifts one step towards Law. If already Lawful, it shifts one step towards Evil. Treat any demand by the wielder of this bow on somebody who owes them a favor as a Suggestion which is not subject to spell resistance. Failure to comply for any reason leaves the target owing a favor, so the bow's wielder may try again with the same or a different favor in the future.

Alternatively, they may resist this corruption, and instead take damage as if they'd shot themselves with the arrow (though the Charm and Merciful effects are both "off" when this is done).

[atemu1234]

Stick to really evil enchantments; look in Book of Vile Darkness, Fiendish Codex, and probably use the Unholy enhancement. Make it on-level, though. And probably you want to look in to having it transmuted, because bone isn't exactly a perfect material for bowmaking.

[Gildedragon]

Making it pitspawned (template) and serremwood (refluffed as some sort of bone) or pandemonic silver (so what, rare items ought rule of cool) might be neat

[Kimras]

Making it pitspawned (template) and serremwood (refluffed as some sort of bone) or pandemonic silver (so what, rare items ought rule of cool) might be neat

could you tell me what books those are in I'm not to familiar with those items

[Gildedragon]

Pitspawned is dmg2
Serremwood and pandemonic silver are special materials (boed and planar handbook (iirc))