Bloodfang Blade

This glistening bloodstone blade emanates an
ominous power. As an Action you may choose
the blade type, it acts as a +2 blade of that type.
Three times per day, as a Bonus Action; you may
activate the blade's Aura of Hate, to deal an extra
1d6 Necrotic damage on a hit for 1 minute.
The sword can cast the Summon Greater Demon
spell once per day, no concentration required.
The sword regains spent charges after the person
attuned to it takes a long rest.
Requires Attunement