Heal. IT Heals one quadrillion HP Every turn.

Magic weapons. It's attacks  Are magical and ignore abilities, resistances and immunities.

Spell immunity. IT is immune to all spells even wish. 

Multiverse shell. If it is damaged the enemy takes double the damage.

Teleport.  It can teleport  anywhere it wants.

Black hole mouth.  Any creature within 60000000000000 ft of the world ender must succed on a DC 1000000000 strenght save(a Nat 20 doesn't succed instantaneusly) or be pulled into it's balck hole mouth.  A creature Takes 100000 damage every turn and 1 Millisecond is counted as 1000000000000000000000 googleplex years for the outside world. You cannot escape (the world ender and allies aren't affected).

Death aura.  When the world ender enters within 6900000000000000ft of a target they must start rolling death saves and if they fail 3 of the saves they die. The world ender is unaffected by this.

Acid blood. If a creature harms it the creature takes 40d20 acid damage.

Incinerating blood. If a creature harms it the creature gets incinirated.

Poisonous aura. The world ender has a toxic cloud around it that affects every creature in 4000ft of the world ender. The creatures gain the following effects. The world ender isn't affected by his own poisonous aura and doesn't get the following effects.

•the creatures get the poisoned condition and they're speed is halved(this affects the creatures even if they're immune to the poisoned condition).

•the creatures take 4900 poison damage(this affects the creatures even if they are immune to poison damage).

•the creatures are blinded and deafened(this affects the creatures even if they are immune to the blinded and deafened condition)

Godly Power. It counts as a higher god in terms of slaying gods. 

Magic weapons immunity. It is immune to any magical weapons features. For example a holy avenger is only a magical +3 weapon against the world ender.

Magical awarness. It knows when it hears a lie.

Glare of death. If it looks at a creature the creature gets turned to stone forever unless the wish spell is casted unto the petrified creature within 6 seconds of the petrification. (It isn't affected by this)

Destructive essence. If it takes 10 or more damage everything in a 100ft line of the wound gets destroyed instantley. (It isn't affected by the line of destruction)

Crit immunity. It isn't affected by critical hits.

Hopeless battle. Any creature actively in combat with the world ender gets one level of exhaustion every round.(it isn't affected by this)

Shield of annihilation. A magical shield surronds the world ender shielding it from any and all harm until destroyed. The shield has 200HP. The shield takes all damage that is directed toward the world ender. The shield must first die in order to damage the world ender. The shield also gives the world ender advantage on all saves as long as the shield is alive.

Silver weapons. It's attacks are considered silvered.

Adamantine weapons. It's attacks are considered adamantine.

Innate spellcasting. It's spellcasting ability is Charisma (saving throw DC 27). It can innately cast the following spells requiring no material components.

At will: fireball(9th level), cloudkill(9th level), summon greater demon(9th level), Power Word kill, mordenkainen's sword, mass polymorph, hold person(9th level), hold monster(9th level ), heat metal(9th level), psychic scream, mighty fortress, ice storm(9th level), meteor swarm, maze, glyph of warding(explosive runes only 9th level), harm, Power Word pain, finger of death.

100/day: imprisonment, wish, foresight, feeblemind, weird, time stop, shapechange, prismatic wall.

 Legendary resistance (500/day). If the world ender fails a saving throw, it can choose to suceed instead.

Otherwordly presence. The world ender rolls initiative 3 times.

Antimagic-aura. If it is within 5000ft of a spell that hasn't come from it the spell stops.

Judgement of the weak. If a creatures attacks it and fails, it can use one of the following things:

• It kills the creature
• It turns the creature into a dretch that Serves under the world ender's command.
• The world ender forces the creature to make a DC 400 Wisdom saving throw. If the target fails it will be sent to a demiplane where it will be tortured for the rest of eternity.

Magical absorption. If it takes acid, cold, fire, lightning, necrotic, poison, psychic, radiant, or thunder damage he heals the damage he takes.

Necrotic field. Within 100ft of the world ender necrotic energy flows through the air causing the following three effects. The world ender isn't affected by any of these affects.

• Every non ally takes 5(1d10) necrotic damage every start and end of their turn. If this brings a creature to 0 HP they must suceed on a DC 27 con save or be turned into a skeleton or zombie (DM's choice).
• Every non ally must suceed on a DC 4000 CON save or get vulnerebility to necrotic damage.
• Undead get 50 more hit points and beckme allies of the world ender.

Titanic Form. Every time it moves on land a earthquake comes, the world ender ignores this earthquake. This earthquake functions like the earthquake spell.

Morningstar of death. This morningstar is a magical Item with 100 charges that reset every hour. Any magical effect uses a DC of 24. While Holding it, the world ender can cast the following spells as bonus actions: Abi-dalzim's horrid wilting(10 charges), dust devil(9th level casting, 3 charges), erupting earth(9th level, 5 charges), storm sphere(9th level, 7 charges), tsunami(14 charges), wall of fire(6 charges). It can only cast 2 of them at once.

Engine of destruction(1000/day). If the world ender drops to 0 HP he gains 5000HP back, reloads all his legendary actions, and uses his actions.

Unkillable. The world ender cannot die unless slain, but, if slain the world ender re-materializes somewhere in the negative planes after 10d10 years.

Energy core. It can, if it is attacked by anything except if the damage type is bludgeoning, piercing, or slashing and the attack misses then he stores the damage that he would've taken and then it can either add that to his next ability check and  saving throw, or he can damage the creature who tried to hit it dealing a number of damage equal to the dice.

Haunt. If a creature has seen the world ender and hasn't died they gets haunting nightmares, visions, and they start hallucinating about the world ender. The creature doesn't benefit from a short or long rest, they get disadvantage on perception checks, and they become insane over the course of 1d10 weeks (if a creature goes insane, roll on the indefinate insanity table in the DMG), and after 1d4 years they Lose 1d12 to their hit point maximum, their intelligence score decreases by 1d10 every day. If a creature dies from this they rise as a Star spawn grue.

Sever soul. If he kills a creature via Black hole mouth it can choose to let them live but he turns their physical form into Zombies and their souls into skulks (except that they're chaotic evil ). These creatures act as allies.

Godly speed. He can replace one of his 3 initiative rolls with a 20.

God killer. If he kills a god he can use his actions again, he absorbs their HP getting temporary HP equal to the god's HP.

 Single weakness. If a creature destroys his Horn (Horn has AC 25 and 25 HP) the world ender gets completely and utterly annhilated from the timeline and time is re-winded to before the world ender Was created and it will not be created ever again, but, to get to the Horn you must get within 5 ft of the world ender succeed on a DC 25 dex check to get to the top of it and then hit the Horn and Deal the damage, but, if this is not completed in 1 round maximum the creature dies from the black hole mouth. Or you can use the crossbow of Aazhul to hit it from a safe distance (I will have created it just search it up). This can only be done by a mortal, as what has created it will destroy it as said in a prophecy.

Multiattack. The destroyer makes 1 Billion attacks.

End beam. Melee Weapon Attack: hit, reach infinite ft., 1000000000 target. Hit: 400000000000 damage. 

Horn attack. RangedWeapon Attack: hit, range infinite/unfamthomable ft., 10000 target. Hit: 1000000000000000000 damage.

tail strike. Melee Weapon Attack: hit, range infinite ft., 10000 target. Hit: 666666666 damage.

bite. Melee weapon attack: range infiniteft., 10000 targets. Hit: infinite damage.

death decisionIt kills up to 420  creatures.

claw. Melee weapon attack: range infinite ft 100000 taargets. Hit: 40000000000000000000000000damage.

destroy. It can  destroy up to 564000 objects.

instill fear. It can frighten 40000000 creatures at once.

Hyper-death-storm. It creates a Storm that starts dissintegrating everything in a 5000ft radius (the world ender isn't affected by this).

Morningstar of death. melee weapon attack: automatic hit., range infinite ft. 500 targets. Instant death. The world ender casts 3 spells at once, summons 50 armanites from the abyss, gives all allies advantage on all rolls for 190 rounds, and finally a blast of heat eminates from the morningstar killing everything except it in a 5000ft line.

enslave. It turns 50 creatures it chooses into it's slaves (these newly formed slaves have the statblock of a molydeus With a additional flying speed of 50ft). It can turn dead or alive creatures into slaves. If it turns dead creatures into it's slaves, the creature gets revived.

turn back time.  

Frightening presents.  All creatures exept it is frightened of the world ender. 

Kill. IT kills the target.

Legendary armor(100/day). if it gets hit it can choose to not get hit.

The world ender has 69000 legendary actions it can use on the start and end of any creatures turn. It regains all it's actions at the end of its turn.

Kill opponent (Costs 3 Actions). It can kill up to 10 creatures within 42000 ft of it.

Hyper beam (costs 100 actions). it releases a HYPER-BEAM which is a 400ft cone with a range of infinite ft and Deals 498000 damage to any target it Hits. It also destroys anything in the way. It is immune to this.

Death pulse (costs 10 actions). it Releases a 1000 by a 1000 ft and anything in the way stops existing. It is immune to this.

Roar of fright (costs 1 action). it can frighten everything in 4000ft of it permanently. It is immune to this.

kill reality (costs 69000 actions). everything in a 798000000000ft circle radius is erased from ever existing in space and time. It is immune to this.

If it somehow drops to 0 HP it re-gains 8500 hit points. It regains all it's  HP (90000 HP) and loses it's mythic actions after not losing HP for 8 hours straight. It gets 400 mythic actions to use during the start of its turn and at the end of its turn.

Summon eldritch storms (Costs 10 Actions). It summmons magical storms which makes any creature (excluding it.) Blinded for 10d100 rounds. This ignores Immunities against the blinded condition. Any creature and object (excluding it) takes 1000000 necrotic damage. This ignores resistances and immunities to necrotic damage. 

Create earthquake (costs 1 action). it creates 1000 earthquakes that destroy any architecture  within 1000000 ft and also Deals 40000000 damage to any creature (excluding it).

Hyperdeath  blast (costs 50 actions). it uses it's death decision Action 400000 times.

Mythic destruction (costs 400 actions). it kills up to 4000000000000000000000000000000000000 creatures at once, destroys the crust of the Planet causing the destruction of every City, town, and village, it will also activate every volcano causing mass destruction, it will also cause massive Canyons that will Split continents and make a hole to the bottom of the planet. It also creates a pulse that erases everything in 4000ft from space and Time (it is immune to this effect).