Cosmic Elemental

Spellcasting

The Cosmic Elemental is a cosmic spellcaster of incomprehensible power.

Spellcasting Level: 20.
Spellcasting Ability: INT (Spell save DC 23, +15 to hit with spell attacks).
Prepared Spells:
Cantrips (at will): Eldritch Bolt, Cosmic Shield.
1st level (4 slots): Astral Pulse, Celestial Wave.

Melee Weapon Attack: +15 to hit, reach 10 ft., 1 target.
Hit: 38 (3d12 + 20) force damage.

Ranged Attack:

Ranged Weapon Attack: +18 to hit, range 120/480 ft., 1 target.
Hit: 24 (2d8 + 10) radiant damage.

Cosmic Surge:
The Cosmic Elemental channels raw cosmic energy, empowering its next melee or ranged attack. The next attack gains an additional +5 to hit and inflicts extra damage of +10 force.

Celestial Shielding:

The Cosmic Elemental envelops itself in a protective shield of celestial energy. It gains resistance to all damage types until the start of its next turn. Additionally, any creature that makes a melee attack against the Elemental during this time takes force damage equal to the Elemental's proficiency bonus.

Gravity Well Grasp:

The Cosmic Elemental manipulates the gravitational forces around a target creature within 60 feet. The target must make a DC 22 Strength saving throw or be pulled 20 feet towards the Elemental and be restrained until the start of the Elemental's next turn. The Elemental gains advantage on its next melee attack against the restrained creature.

Reaction Name.  Cosmic Deflection:
When targeted by a ranged attack, the Cosmic Elemental can harness the cosmic energies to deflect the attack. The attacker must make a DC 20 Dexterity saving throw or suffer the consequences of their own assault.
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Legendary Actions (Costs 3 Actions):

Cosmic Cataclysm:
The Cosmic Elemental unleashes a cataclysmic burst of cosmic energy, affecting all creatures within a 30-foot radius. Each affected creature must make a DC 22 Constitution saving throw, taking 66 (6d10 + 30) force damage on a failed save, or half as much on a successful one. Additionally, those who fail the save are knocked prone as they grapple with the cosmic forces unleashed. This ability can only be used once per round.

Mythic Actions: Cosmic Unleashing

The Cosmic Elemental possesses legendary powers beyond the comprehension of mortal beings. These mythic actions allow it to unleash the full extent of its celestial might.

Mythic Actions:

Stellar Convergence:

The Cosmic Elemental draws power from the stars, creating a gravitational force that pulls all creatures within a 40-foot radius towards a central point. Affected creatures must make a DC 22 Strength saving throw or be restrained until the end of their next turn. The Cosmic Elemental gains temporary hit points equal to the total hit points restrained creatures have lost.

Eclipse of Reality:

The Cosmic Elemental shrouds the area in a cosmic eclipse, plunging it into temporary darkness. All creatures within a 30-foot radius must make a DC 23 Constitution saving throw or be blinded until the end of their next turn. The Cosmic Elemental gains advantage on its attacks until the end of its next turn.

Celestial Mastery:

The Cosmic Elemental taps into the celestial energies, gaining unparalleled control over the elements. It can cast a spell from its list of prepared spells without expending a spell slot. The spell's level can be up to half the Cosmic Elemental's challenge rating, rounded down (minimum of 1).

The Cosmic Elemental can use one mythic action at a time, at the end of another creature's turn. It regains spent mythic actions at the start of its turn. These mythic actions showcase the overwhelming cosmic power the Elemental wields, reshaping reality to suit its celestial nature.