Asparagus the Angelbane

Ancient Mind. Can speak and read any writing, has immeasurable knowledge about the Multiverse

Divine Awareness. Knows if it hears a lie.

Keen Observer. Cannot be surprised while in combat.

Supernatural Speed. Can use a Bonus Action to take another action once per turn.

Spellcasting. [Asparagus the Angelbane] is a 20-level spellcaster. Its spellcasting ability is [Intelligence] (spell save DC 20, +15 to hit with spell attacks). [Asparagus the Angelbane] has following  spells prepared:
(at will): [Aid], [Arcane Eye], [Bane], [Control Water], [Create Food and Water], [Inflict Wounds].
(10 slots): [Arcane Gate], [Awaken], [Dissonant Whispers], [Control Weather], [Divine Word], [Dream], [Finger of Death], [Power Word Kill], [Modify Memory], [Phantasmal Killer], [True Ressurection], [Weird].

Dimensional Shift. Asparagus the Angelbane teleports for up to 60ft in any direction (can be divided for up to 3 jumps for a total distance of 60ft). It then makes 3 Melee Attacks or 2 Ranged Attacks.

Heavenly Strike. Melee Weapon Attack: +15 to hit, reach 5 ft., 1 target. Hit: 21 (3d8 + 6) [radiant] damage. A creature hit by this attack must make a DC 14 Strength saving throw or be thrown 10ft and knocked prone.

Psychic Onslaught. Ranged Weapon Attack: +15 to hit, range 10/60 ft., 1 target. Hit: 30 (6d6 + 6) [psychic] damage. A creature hit by this attack must roll a DC 14 Wisdom saving throw or become frightened until the end of its next turn.

Weakness in Strength. If a player hits [Asparagus the Angelbane] with a Critical Hit, it taken a bonus turn after that player's turn. During that turn, it deals 1D4 extra [radiant] damage and 1d4 [psychic] damage on its Melee and Ranged attacks respectively.

[Asparagus the Angelbane] can shift between his Human Form and Aboleth Form as a bonus action. While in Human Form, its size is Medium and it gains the following Legendary Actions:

Cleansing Beam (Costs 2 Actions). [Asparagus the Angelbane] calls upon the might of the Heavens to destroy his foes, concentrating for one Action and summonning a pillar of light with a 50ft. radius witht the second action. Each creature within the radius must make a DC18 Constitution saving throw. On a failed safe, the creature takes 60 (10d10) [radiant] damage and is blinded until the end of its next turn, taking half as much damage on a successful save and avoiding the Blind.

Eldritch Spellcaster (Costs 1 Action). For the next minute, [Asparagus the Angelbane] can cast any spell as a bonus action or a reaction.

While in Aboleth form, [Asparagus the Angelbane] is Huge and gains the following actions:

Devoured Legion (Costs 3 Actions). Summon the Spirits in the shapes of various Divine creatures to battle.

Almighty Benefactor (Costs 1 Action). Cast Wish once a day without expending a spell slot.