Alois' Sword of the Abyss

A silvered Longsword with a shifting Damascus-like pattern, born from the corpse of the Zelosus himself. 

While Dormant, you gain a +1 to attack and damage rolls with this weapon and, when you hit a creature with an attack using this magic weapon, the target takes an extra 2d6 Cold damage and must succeed on a DC 15 Constitution saving throw or be unable to regain Hit Points for 1 hour. The target repeats the save at the end of each of its turns, ending the effect on itself on a success. 
When Awakened, the bonus for attack and damage rolls increases to +2 and, if your attack roll exceeds the target creature's AC by 5 or more, the target must succeed on a DC 15 Charisma Saving Throw or suffer the effects of the Banishment Spell.
Once Exalted, the bonus for attack and damage rolls increases to +3 and the DC to resist the sword's magical effects increases to DC 18. Additionally, you may target yourself or an ally with any of the sword's magical effects as a Magic action without dealing damage.
After Exalting, targets affected by the sword remain marked for 10 minutes. At any time, you may use half your movement to teleport adjacent to a marked creature within 120ft.

This item can be used as a spell focus.

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

Notes: Damage: Cold, Versatile, Sap