Blade of blood, flame, and shadow/Blade of the cruel trifecta

The caster transforms a target weapon or object in their line of sight into a powerful blade of shadowy-flame, dripping blood, for one day. After that day is over, the object enchanted resumes the original form it had before the caster cast this spell. To cast this spell, you lose 7 hit points. The blade of blood, shadow and bone has these effects:

When a creature attacks with the enchanted object that has been transformed into the blade of blood, flame, and shadow, They have the advantage roll on their attack, they also deal an extra 7 hit points of damage if the attack landed successfully. When they are harmed by a spell or attack, they are dealt half the damage, and any effects of the spell will only last for one round and do not need a saving throw.

 (When the user attacks, you may choose blood.) Blood: Any creature dealt damage with this weapon loses 4 hit points every single round until it has been vanquished or destroyed. When blood is chosen, it may not be picked again until the user of the blade of blood, flame, and shadow takes a short rest. This effect DOES stack.

Flame: Whenever the user of the blade of blood, flame, and shadow is dealt damage by a creature, it may create a dome of fire around itself that renders the creature that last attacked it unable to attack it until the user of this weapon chooses to remove the dome. While in the dome, the user is still susceptible to spells, and can still attack, but it will only deal half damage. When Flame is chosen, it may not be picked again until the user of of the blade of blood, flame, and shadow takes a short rest. When the user choses flame, the flame effect lasts for up to 4 rounds, determined by rolling a d4.

Shadow: Whenever the user of the blade of blood, flame, and shadow is taking a rest or targeted by a spell, the user may choose shadow. If they do, they are rendered invisible until they have been successfully attacked, and whenever they need to use a Dexterity saving throw, they have the advantage of the roll while invisible. They also have maximum speed (20) and Darkvision. When the user attacks, they have the option to sneak attack. They may deal an extra 4d6 of damage if they do sneak attack. When Shadow is chosen, it may not be picked again until the user takes a long rest.

Caster= the party member that cast this spell and enchanted an object

User= the party member wielding the Blade of blood, flame, and shadow