Infernal Sovereign Helm
The combination of 'Helm of Hades' and 'Crown of Primal Fire'. These two give the user great power among those weaker than it
Passive: +1 to DEX, INT, WIS, immune to the petrification/frightened effect
Infernal Protection: While wearing the Infernal Sovereign Helm, you have resistance to fire damage and immunity to fear effects.
Fire Aura: As a bonus action, you can activate the Hellfire Aura. For the next minute, any creature that starts its turn within 10 feet of you takes fire damage equal to your Charisma modifier (minimum of 1). This ability can be used once per short or long rest.
Hades' Gaze: As an action, you can target one creature you can see within 60 feet. The target must succeed on a Wisdom saving throw or be frightened for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. This ability can be used once per long rest.
Blaze of Sovereignty: As an action, you can summon a column of fire at a point you can see within 60 feet. Each creature in a 10-foot radius, 40-foot-high cylinder centered on that point must make a Dexterity saving throw, taking 10d20 fire damage on a failed save, or half as much damage on a successful one. This ability can be used once per long rest.
Infernal Command: While attuned to the Infernal Sovereign Helm, you can communicate telepathically with any fiend within 120 feet. Additionally, you have advantage on Charisma (Intimidation) checks against fiends.
Drawn to Fire: Use a bonus action to teleport anywhere that is within 5ft of fire or flame oncer per long rest
Control Undead: As an action, any undead within 30ft of you, you can control if they fails the WIS saving throw unless they are being controlled by someone else