Arceus

Divine Soul. Arceus has advantage on all saving throws and all skill checks

Legendary Resistance (3/Day). If Arceus fails a saving throw, he can choose to succeed instead.

Creator's Prelude. Arceus can change the damage type he inflicts and Judgement gains a unique effect based on the active damage type. Arceus gains immunity to the active damage type

• Acid = Judgement deals Acid damage and the target must pass a Con Saving Throw of 18 per piece of worn equipment. Failing the roll will destroy the equipment
• Bludgeoning = Judgement deals Bludgeoning damage and the target must pass a Strength Saving Throw of 18 or be knocked Prone
• Cold = Judgement deals Cold damage and the target must pass a Con Saving Throw of 18 or have their movement speed reduced to half for 3 minutes
• Fire = Judgement deals Fire damage and the target must pass a Con Saving Throw of 18 or take 3d5 Fire damage per turn for 1 minute unless flames are put out
• Force = Judgement deals Force damage and the target must pass a Strength Saving Throw of 18 or be knocked back 50 ft
• Lightning = Judgement deals Lightning damage and the target must pass a Strength Saving Throw of 18 or be Paralyzed 
• Necrotic = Judgement deals Necrotic damage and the target must pass a Con Saving Throw of 18 or lose the ability to cast spells for 5 minutes
• Piercing = Judgement deals Piercing damage and the target must pass a Con Saving Throw of 18 or take an extra +3 damage per point in AC
• Poison = Judgement deals Poison damage and the target must pass a Con Saving Throw of 18 or be poisoned for 5 minutes
• Psychic = Judgement deals Psychic damage and the target must pass a Wisdom Saving Throw of 18 per turn for 1 minute or be forcibly teleported to a random open spot within 50 ft of their position
• Radiant = Judgement deals Radiant damage and the target must pass a Charisma Saving Throw of 18 or be charmed for 3 minutes
• Slashing = Judgement deals Slashing damage and melee attacks of Arceus gain +5 on their damage, stacks
• Thunder = Judgement deals Thunder damage and the target must pass a Con Saving Throw of 18 or be stunned for 1 minute

Creator's Finale. If Arceus has used Creator's Prelude to cycle through all forms and is below 10% hp or less, Arceus uses all of his actions for free. After this has concluded, Arceus loses all resistances and immunities, and Divine Soul deactivates for the reminder of the fight

Godly Dealings. When Arceus hits 75%, 50%, and 25% hp, he gains an extra action per turn per threshold

Divine Prayer. Arceus heals for 5d6+10 hp. All targets within 30 ft must make a Wisdom Saving Throw of 18 or take 2d5 Radiant Damage

Divine Creation. Arceus alters the structure of the terrain around him in a radius of 100 ft, randomly raising and lowering parts of the terrain

Winds of Delta. Arceus disables the effects of any active weather until he chooses to lift the effects of Winds of Delta

Call of Order. Arceus disables the buffs and debuffs to stats of all targets, including himself, within 200 ft

Lifemancer. Arceus absorbs life energy on this turn, and on the next, he gains a +2 to his AC against Magical sources, +20 to his movement speed, and +5 to magical based sources of damage he inflicts added on

Divine Trampling. Melee Weapon Attack: +19 to hit, reach 45 ft., single target. Hit 20 (2d10 + 10) Radiant damage (As part of this action, Arceus can move up to 45 ft through a line through a target. Target must pass a Strength Saving Throw of 18 or be knocked prone)

Piercing End. Melee Weapon Attack: +19 to hit, reach 15 ft., single target. Hit 25 (3d10 + 10) Piercing damage (does 1.5x damage against a target knocked prone)

Spacial Rend. Melee Magical Attack: +19 to hit, reach 20 ft., single target. Hit: 30 (5d8 + 10) Psychic damage. (Target must pass a Wisdom Saving Throw of 18 or be forcibly relocated into an open space somewhere in a radius of 600 ft)

Roar of Time. Ranged Magical Attack: +19 to hit, reach 100 ft., multiple targets. Hit 35 (5d10 + 10) Psychic damage (Fired in a straight line 15 ft wide. All hit must pass a Con Saving Throw of 18 or gain 2 stacks of Exhaustion) 

False Nova. Ranged Magical Attack: +19 to hit, reach 100 ft., single target. Hit 21 (3d7 + 10) Psychic damage (Applies Psychic Terrain in a radius surrounding the hit target of a 50 ft, circular. All reactions are disabled within this terrain and the terrain lasts for 5 minutes)

Oblivion Fall. Ranged Magical Attack: +19 to hit, reach 80/320 ft., single target. Hit 20 (2d15 + 10) Necrotic damage (Arceus heals for half of the damage inflicted)

Flarebolt. Ranged Magical Attack: +19 to hit, reach 80/320 ft., single target. Hit 26 (4d8 + 10) Thunder damage (Target must pass a Con Saving Throw of 18 or have their resistances and immunities suppressed for 3 minutes)

Judgement. Ranged Magical Attack: +19 to hit, range 200/600 ft., single target. Hit: # (10d10 + 10) Varied Type damage. (Gains a unique effect based on active damage type due to Creator's Prelude)

Ward of Shadows. If hit by a melee attack, Arceus can use his reaction to have a sinister shadow lash out against them with shadowy tendrils that deal 1d5 Necrotic damage each. A creature must pass 6 Athletics Saving Throws of 14 to avoid all tendrils.

Shorthand Prelude. Arceus can use his reaction prior to being hit to use Creator's Prelude to adjust his damage type

Relocation. Arceus can use his reaction to teleport up to 400 ft away from a target about to strike them

Arceus has 3 legendary actions, refreshed on his next turn, and able to be used at any time.

Divine Sight (costs 1 action) - Arceus makes a Perception Check to locate all beings within 300 ft

Divine Presence (costs 1 action) - Arceus gains a free usage of either Divine Prayer or Divine Creation

Divine Flight (costs 1 action) - Arceus gains additional free usage of his movement to move as he sees fit