Rare Wondrous Item (Banner), Requires Attunement

• This banner’s features and abilities can only be active or activated if you are holding it in at least one hand. 

Unearthly Aura. Each time a creature within 15 feet of you takes necrotic damage, they take 5 extra necrotic damage. 

Unholy Empowerment. As a bonus action, you can choose a creature within 30 feet of you. That creature’s next successful weapon attack made until the end of its next turn deals extra 1d6 necrotic damage. 
Deathly Miasma. When a living creature or aberration within 30 feet of you is brought to 0 Hit Points, you can use your reaction to make heavy pestilent miasma come out of their wounds. Any creature within 5 feet of them must make a DC 14 Constitution saving throw, taking 1d8 necrotic damage on a failure.