Weapon

Rare Negative Energy Requires Attunement

Weapon (any sword)

Enchantment

You gain a +1 bonus to attack and damage rolls made with this magic weapon.

When you attack a creature with this magic weapon and roll a 20 on the attack roll, that target takes an extra 3d6 necrotic damage, provided that the target isn’t a construct or an undead. You gain temporary hit points equal to the extra damage dealt.

Enchantment Weapon Skill

Fel Aura. As a bonus action you may spend one weapon skill use to emit a degenerative aura centered on yourself. While holding the blade, the aura emanates in a 10 foot radius for the next minute (30 feet radius if your a 18th level paladin or higher). Creatures other then yourself within this aura take 1d4 necrotic damage when they start their turn or end their turn within this radius. Creatures immune or resistant to necrotic damage take full damage from this effect, excluding constructs.

Weapon Properties

The same as the specified weapon's weapon properties.

Weapon Skills

The same as the specified weapon's weapon skills.

Weapon Passive

The same as the specified weapon's weapon passive.

This sword ends in two fang like tips of remarkable sharpness. Dark veins of black metal run through the center of the blade down to the guard, highlighting the light grey edges of the blade. You can't help but feel a bit hungry when holding it.

Crafting

Based on Heliana's Guide crafting rules

Cost: 3,000 gp + sword price
Weight: Varies