Vuduu

Very well, you are worthy...

Vuduu is the final boss of the Subspace Event. He appears to be a crystalline blue man with a black orb that has blobs of magenta flowing through it. This boss is very hard to defeat due to the strength of the attacks as well as the amount of health he has. He is the only boss to use the alternative temporary block replacement arena: Vuduu's Domain, which appears to be his large crystal wings set out on the ground.

Stage 1 (1000000 HP [Large Rainbow Wings])
Ancient Curse: For this attack, Vuduu vanishes from the screen and something that appears to be the forbidden armor set bonus entity flies around, locks onto you, and shoots you up the screen before slamming you to the ground, dealing 200 damage.

Hawkeye Beam: This attack allows him to fly off the screen to the side and come back with a large, hawk head shaped laser cannon that shoots an oversized Phantasmal Deathray horizontally. This does 120 damage.

Shark Blade: This attack is very similar to the Hawkeye Beam: he summons a head from the side of the screen that charges at you, dealing 300 damage if you get hit.

Stage 2 (500000 HP)
When this stage starts you disappear and a blue sphere destroys the wings. After this you are stronger, faster, and temporarily look like Sonic the Hedgehog until he is defeated or you die.

Ghastly Projection: He teleports to the middle of the screen and shoots projectiles that look exactly like him in every direction. He is still vulnerable, but it's hard to hit him because of the projectiles. Touching one does 100 damage and touching the explosion causes 200 damage, resulting in a total 300 damage from one attack.

Devastation Shockwave: This attack is, as the name says, devastating. Vuduu releases shockwaves that do 10 damage each but they aren't meant to kill you themselves, they're meant to kill you with a Ring-Out.

Colossus Eye Lasers: For this attack Vuduu teleports off screen to the left, becomes colossal and shoots red lasers from his eyes that deal 150 damage each.

Stats
Health: 1000000

Defense: 175

Attack Damage: Varies, Devastatingly high.

Drops
Subspace Scepter (50%, summons Vuduu Minion)

Ancient Doom (25%, shoots a subspace bomb that does 500 damage and creates an AOE)

Vuduu Mask (1.25%)

Vuduu Trophy (0.999%)

Vuduu's Wrath (20%, shoots a Subspace shockwave in the direction of the cursor)

Trivia
The player death message is "[Playername] succumbed to subspace annihilation."

The message at the top of the page is his defeat message.

He is a reference to the final boss of the story mode on Super Smash Bros. Brawl, Tabuu.