This Feat grants the following abilities for the wielder of The Shadow Sword:
As a bonus action, you can create a 5 foot cube of shadow within 30 ft.
When you hit a creature with The Shadow Sword within 5 feet of your shadow cube, you can use a bonus action to consume the shadow cube and cause the target to take 6d6 necrotic damage. You cannot use this feature again until you finish a long rest.
After taking 20 lives, The Shadow Sword gains the following abilities:
Once per long rest, you can cast the Animate Dead spell.
Three times per long rest rest, you can cast the Darkness spell.