Simple melee weapon (quarterstaff), 1d6 damage, Versatile (1d8) (requires attunement by a warlock of non-lawful alignment)
A six foot staff made of a dark ebony with a jewel sitting at the tip, which shines like a piece of night sky, filled with stars. The heft of the is decorated with pieces of cut obsidian which can be very sharp. Anyone not familiar with the staff has a slight chance to cut their hands while holding and wielding the staff.
While holding Blackstar you gain darkvision out to a range of 60 feet. The staff is used as an arcane focus for spells. Even for those which don’t require one.
Bonus to hit: +1
Bonus to damage: +1
Whenever you use it to reduce a creature to 0 hit points, either by melee attack or when using Blackstar as an arcane focus for a damage dealing spell, the staff slays the creature and devours its soul, unless it is a construct or an undead. A creature whose soul has been devoured by Blackstar can be restored to life only by a wish spell. Blackstar‘s hunger for souls must be regularly fed. If the staff goes one ride or more without consuming a soul, a conflict between you occurs at the next sunset.
When it devours a soul, a harmless flash of intense pain shoots through your body after which Blackstar grants you temporary hit points equal to 25% (rounded down) of the slain creature’s maximum hit points. These hit points fade after 24 hours.
If you use Blackstar to hit an undead with a melee attack or as an arcane focus for a damage dealing spell, you take 1d4 necrotic damage and the target regains hit points. If this necrotic damage reduces you to 0 hit points, Blackstar devours your soul.
While you hold Blackstar, you are aware of the presence of Tiny or larger creature within 60 feet of you that aren’t constructs or undead.
While holding Blackstar, you gain a +1 bonus to spell attack rolls and to the saving throw DCs of your warlock spells. In addition, you can regain one warlock spell slot as an action while holding Blackstar. You can’t use this property again until you finish a long rest.