Domain Expansion: Arcane Annihilation

As you utter the incantation, a surge of magical power envelops you. Your eyes blaze with arcane intensity, reflecting the chaotic energy coursing through your veins. Shadows dance around your figure, and your very presence warps the fabric of reality.

In the ethereal space that separates the known realms, the energies of eldritch mysteries, infernal realms, abyssal depths, and draconic majesty converge upon you. Your form becomes a living conduit, a nexus of magical might.

Upon Activation (Visual): A swirling, iridescent aura surrounds you, comprised of ever-shifting hues that mirror the essence of the realms you command. Faint whispers of eldritch secrets, the heat of infernal flames, the unsettling echoes of the abyss, and the roar of draconic power manifest around you.

Buffs Granted:

1. Arcane Mastery: "Your fingertips glow with an eldritch hue, and your eyes gleam with the wisdom of forgotten ages. Each word of your spells resonates with the power of arcane mastery."
   All attacks on a creature within the domain automatically hit. You gain advantage on all  and spell saving throws. Your spellcasting ability score increases by +4 for the duration.

2. Eldritch Precision: "Shadows coalesce around your weapons, turning them into instruments of precise death. Every swing, every shot, is guided by the unseen forces of the eldritch and the shadows of your assassin past."
   Your attacks, both magical and mundane, have a precision born from your assassin training. All your attacks score critical hits on a roll of 18-20.

3. Abyssal Resilience: "Shadows solidify into a protective shroud, deflecting blows and instilling fear in those who would seek to harm you. The whispers of the abyss become a shield against physical harm."
   You gain resistance to slashing, piercing, and bludgeoning damage. Additionally, you are immune to the frightened condition.

4. Infernal Dominion: "Infernal wings materialize, wreathed in dark flames. As they unfurl, you gain dominion over the skies, your silhouette casting an imposing shadow over the battlefield."
   As a bonus action, you can summon a pair of infernal wings, granting you a flying speed of 60 feet. You can dismiss or summon the wings as a free action.

5. Draconic Fury: "Your spells and attacks leave trails of draconic energy, each strike resonating with the elemental power of dragons. The air crackles with the fury of your draconic knowledge."
   Once per turn, when you deal damage with a spell or attack, you can add an additional 2d6 damage of a type associated with dragons (acid, cold, fire, lightning, poison). You can choose the damage type each time.

Debuffs Granted:

1. Chaos Infliction: "The very air distorts, and shadows leap from your form to assail your foes. Chaos incarnate, the aura surrounding you projects a field of disorienting energy, sowing confusion and doubt."
   All saving throws made by a creature within the domain automatically fail. Any enemy that starts its turn within 30 feet of you must make a Wisdom saving throw or suffer disadvantage on attack rolls and ability checks until the start of its next turn.

2. Abyssal Enervation: "Your enemies find their very essence drained as they step into the abyssal aura emanating from you. Movement becomes sluggish, and strength wanes under the oppressive weight of the abyss."
   Enemies hit by your spells or attacks have their movement speed halved until the end of their next turn.

3. Infernal Desolation: "The ground beneath you ignites, leaving a trail of infernal flames. Your enemies tread upon desolation as they face the relentless advance of your arcane might."
   Any creature within 15 feet of you at the end of their turn takes 2d8 fire damage.

4. Draconic Banishment: "With a draconic roar, a flicker of your draconic blood manifests, allowing you to banish those who dare challenge your supremacy to the far reaches of existence."
   Once per round, when a creature damages you with an attack, you can use your reaction to force it to make a Dexterity saving throw or be banished to a random plane of existence for 1 minute.

As the Domain Expansion unfolds, you stand as a living convergence of magical forces, a harbinger of annihilation to those who would oppose the might of your arcane mastery.