The Wrath of the Old Ones, known as Asturgwa Anneth in the ancient language, is a powerful weapon of twisted eldritch magic. The bow takes on a lifelike shape, made of tentacles and eyes, and it produces its own arrows when the string is pulled and no arrow is present.

You have a +1 bonus to attack and damage rolls made with this magic weapon. The weapon has 5 charges, and it regains any expended charges whenever you take a long rest. If the weapon is not enhanced, as described below, you can use your bonus action to spend 1 charge and make a charged shot. If you do, your next attack made with the bow that round deals an extra 1d6 force damage to the target and to each creature within 5 feet of it.

The bow has four enhanced forms, bestowed only to those who can appease the spirits trapped within the four reforged arrows. 
Ahmahm Arrow. The True Neutral spirit that inhabits this arrow tasks adventurers with tremendous feats of marksmanship.
Gosata'ahm Arrow. The Neutral Evil spirit that inhabits this arrow tasks adventurers with sacrificing six souls to it, and collecting six skulls.
Ahmhogaroc Arrow. The Chaotic Neutral spirit that inhabits this arrow tasks adventurers it deems worthy with producing grand displays of fire.
Kreemasaleet Arrow. The Lawful Good wolf spirit that inhabits this arrow tasks adventurers it deems worthy with purifying sacred sites or destroying undead to unlock its power.

1. Kreema'ahm la Ahmahm (Storm). If you possess the Ahmahm Arrow, you can imbue the Wrath of the Old Ones with its power over a short or long rest.
   Augmented Bow. You have a +2 bonus to attack and damage rolls made with this magic weapon.
   Storming Shot. When you hit a creature with an attack using the bow, that creature takes an extra 1d8 lightning damage.
   Eye of the Storm. When you make a charged shot against a creature, you produce an electric storm. Each creature within 10 feet of the target must make a Dexterity saving throw (DC equals 8 + twice your proficiency bonus), taking 2d8 lightning damage and be pushed 5 feet away from the creature targeted for the attack on a failed save, or half as much damage (and no additional effects) on a successful one.
2. Kreegakaleet lu Gosata'ahm (Decay). If you possess the Gosata'ahm Arrow, you can imbue the Wrath of the Old Ones with its power over a short or long rest.
   Augmented Bow. You have a +2 bonus to attack and damage rolls made with this magic weapon.
   Decaying Shot. When you hit a creature with an attack using the bow, that creature takes an extra 1d6 necrotic damage.
   Chattering Echoes. When you make a charged shot against a creature, you can choose up to 6 other creatures within 30 feet of the original target. Each chosen creature takes 1d6+2 necrotic damage which ignores any resistances to necrotic damage, then, if any of those creatures die, you can choose new targets to deal the damage to, up to the number of creatures that died that way.
3. Kreeaho'ahm nal Ahmhogaroc (Blaze). If you possess the Ahmhogaroc Arrow, you can imbue the Wrath of the Old Ones with its power over a short or long rest.
   Augmented Bow. You have a +2 bonus to attack and damage rolls made with this magic weapon.
   Incinerating Shot. When you hit a creature with an attack using the bow, that creature takes an extra 1d12 fire damage.
   Blast of Magma. When you make a charged shot against a creature, it can become encased in magma. It must make a Constitution saving throw (DC equals 8 + twice your proficiency bonus). On a failed save, it takes 3d12 fire damage, and its movement speed becomes 0 until the end of its next turn. On a successful save, it takes half as much damage and it isn't slowed.
4. Kreeholo lu Kreemasaleet (Wolf). If you possess the Kreemasaleet Arrow, you can imbue the Wrath of the Old Ones with its power over a short or long rest.
   Augmented Bow. You have a +2 bonus to attack and damage rolls made with this magic weapon.
   Moonlight Bane. When you hit a creature with an attack using the bow, that creature takes an extra 1d10 radiant damage.
   Soul of the Wolf. When you make a charged shot against a creature, the wolf's spirit manifests. Make another attack roll against a creature within 10 feet of the original target. On a hit, that creature takes 4d10 radiant damage and is knocked prone. Undead and creatures that specify silver weaponry for circumvention of damage immunity and resistances take maximum damage, instead.

Proficiency with a Shortbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Damage, Combat, Ammunition, Range, Two-Handed, Vex