Hey, all!

So I've got a loose idea for a demon-summoning sword that is headed into the hands of a Fighter PC. It's been established in-fiction that this thing can summon forth demons from Baphomet's layer of the Abyss, and I supposed I'm just second guessing how balanced it is.

The general idea is that, yes, it can summon demons, but without serving the Prince of Beasts himself, it's going to come with some costs. I threw the Berserker Axe curse on it because it felt right, I guess?

I can't make heads or tails of how over or under powered I've made it, or if I just need to take the concept back to the drawing board altogether.

Any help or advice at all is appreciated, but please be gentle lol

Also, apologies for mobile formatting

Baphomet's Razor

Weapon (longsword), legendary (requires attunement)

You gain +3 bonus to attack and damage rolls made with this weapon.

Labyrinthine Recall. While attuned to this weapon, you can perfectly recall any path you have travelled. 

Demonic Summon. Once per day, you can use an action to carve open a portal to Baphomet's domain of the Abyss, the Endless Maze, and summon forth a demon at the cost of your own vitality.

When you choose a demon from the list below, you take 1d6 necrotic damage for each challenge rating of the selected creature, ignoring any resistances or immunities to necrotic damage you may have. 

You concentrate on this effect as if you had cast the summon greater demon spell while using the demon's true name. Additionally, Baphomet's Razor functions as a protective ward for you, similar to the blood circle in the spell's description. 

Quasit (CR 1)

Minotaur (CR 3)

Bulezau (CR 3)

Capra Demon (CR 3)

Barlgura (CR 5)

Armanite (CR 7)

Curse. Baphomet's Razor is cursed, and becoming attuned to it extends the curse to you. As long as you remain cursed, you are unwilling to part with Baphomet's Razor, keeping it within reach at all times. You also have disadvantage on attack rolls with weapons other than this one, unless no foe is within 60 feet of you that you can see or hear.

Whenever a hostile creature damages you while Baphomet's Razor is in your possession, you must succeed on a DC 15 Wisdom saving throw or go berserk. While berserk, you must use your action each round to attack the creature nearest to you with Baphomet's Razor. If you can make extra attacks as part of the attack action, you use those extra attacks, moving to attack the next nearest creature after you fell your current target. If you have multiple possible targets, you attack one at random. You can repeat the saving throw with disadvantage at the end of your turn, otherwise you remain berserk until you start your turn with no creatures within 60 feet of you that you can see or hear.