Sword of the Guardian

Weapon (any sword), very rare (requires attunement)

Only twelve of these swords were forged from the divine power of the heavens, created by the sheer force of will of the Archangels that wield them. These twelve Guardians were each charged with guarding a place of sacred significance. When Lucifer rebelled, 5 of these Guardians fell with him, leaving only 7 Guardians who remained loyal to God. However, once made, a Guardian's sword cannot be unmade. The swords of these fallen guardians still exist somewhere in the cosmos, yearning for the destruction of their former owners.

You gain a +2 bonus to attack and damage rolls when you wield this magic weapon. If you target the sword's original owner with an attack, you gain a +4 bonus to attack and damage rolls as the sword wills its owner's death.

As a bonus action, you can speak this sword's command word, causing lightning to arc across the surface of the blade. The sword deals an extra 2d8 lightning damage while this effect is active. The effect ends when the sword is sheathed, dropped, or when you choose to do so with a bonus action.

Bible5e custom item. Its specific properties supplement the standard magic item rules.