Bifrons, Duke of Supremacy

Bifrons weakness. any who hold Bifrons heart can charm him as if Bifrons did not have an immunity to that condition. 

Demon Armor Curse. Once you don this cursed armor, you can't doff it unless you are targeted by the remove curse spell or similar magic. While wearing the armor, you have disadvantage on attack rolls against demons and on saving throws against their spells and special abilities.

llumination. Bifrons sheds bright light in a 25-foot radius and dim light for an additional 25 feet.

Innate Spellcasting. Bifrons innate spellcasting ability is charisma (Spell save is DC 21, +13 to hit with spell attacks). He can innately cast the following spells, requiring no material components:

At will: alter self ( can become Medium when changing his appearance), animate dead, charm person, detect magic, dispel evil and good, fly, invisibility (self only),

3/day:  dispel magic, hold person, line of lightning, wall of fire

Legendary Resistance (3/day). if Bifrons fails a saving throw, he can choose to succeed instead.

Magic Resistance. Bifrons has advantage on saving throws against spells and other magical effects.

Magic Weapons. Bifrons's weapon attacks are magical.

Ethereal Supremacy (3/day).  Bifrons bends the ethereal plane so that he can attack and be attacked from across the ethereal boundary. when an attack is made from across the ethereal boundary it is made at disadvantage, its damage is halved before hitting the target, and can-only target the ability holder(s) (Bifrons). However, when the ability holder(s) (Bifrons) makes an attack from across the ethereal boundary, the attack suffers no such penalty's. These changes last for 30 seconds after Bifrons activates his ability, and only ends early if Bifrons is incapacitated. 

Multiattack. Bifrons makes four attacks: one with his longsword and one with his whip and two with his Gauntlets, or all four attacks can be Gauntlet attacks.

+1 Clawed Gauntlet. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 24 (3d8 + 10) slashing damage.

Longsword. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 22 (3d8 + 9) slashing damage plus 13 (3d8) lightning damage. If Bifrons scores a critical hit, it rolls damage dice three times, instead of twice.

Whip. Melee Weapon Attack: +16 to hit, reach 30 ft., one target. Hit: 16 (2d6 + 9) slashing damage plus 10 (3d6) fire damage, and the target must succeed on a DC 21 Strength saving throw or be pulled up to 25 feet toward Bifrons.

Ethereal Stride. Bifrons and up to three willing creatures within 15 feet of him magically enter the Ethereal plane from the Material Plane , or vice versa.

Teleport. Bifrons and up to three willing creatures within 15 feet of him magically teleport, along with any equipment they are wearing or carrying, up to 120 feet to an unoccupied space Bifrons can see.

Bifrons can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Bifrons regains spent legendary actions at the start of his turn. 

Vengeance. Bifrons makes a whip or gauntlet weapon attack against one target, if the target has harmed Bifrons or one of his allies this attack is made with advantage.

Ethereal Stride. Bifrons uses his ethereal stride action.

Shared Supremacy (Cost 3 Actions). Bifrons extends his supremacy ability bonuses to include up to three other creatures categorizing them as ability holders as described in the ability. this extension lasts until Bifrons ability ends or is reactivated.

Teleport. Bifrons uses his Teleport action.