Grand Eerie

A sketch of the Grand Eerie

Grand Eerie is an anomalous ghostlike boss, found in some personalized copies of Super Mario 64. The details that make Grand Eerie different to an ordinary Eerie are that his eyes are red, he is much bigger than a big Eerie, he wears a crown and has sharp teeth like a Blargg from Yoshi's Island.

Boss Fight

Grand Eerie replaces the Big Boo bosses in Big Boo’s Haunt. Some Grand Eerie boss fights function similarly to the regular and big Eeries, but he has a breath of blue fire that damages Mario. When looked at, he hides his teeth and shrinks before going transparent, like a Boo. He is also damaged the same way as a Boo and Eerie would, by being ground pounded with the player's back turned towards the boss. Some Grand Eerie boss fights have Grand Eerie vanishing and teleporting behind the player once looked at. The amount of hits it takes to defeat Grand Eerie varies, with the consensus being 3-5 hits.

Boss Fight Variants

Balcony

This boss fight occurs on the balcony of Big Boo's Haunt replacing the Big Boo boss. The fight itself is commonly said to be the easiest of the boss fights with the player only needing to hit the boss 3 times in order to defeat it. The Grand Eerie is almost identical to the Big Boo Boss, only being slightly faster than the Big Boo itself.

First Floor

This boss fight occurs on the first floor of Big Boo’s Haunt after defeating all the Boos on the first floor. The Grand Eerie boss that appears is more difficult than the balcony Grand Eerie boss. The boss has been reported to vanish and teleport behind Mario at a close distance after being looked at. The boss only needs to be hit 4 times in order to defeat it.

Merry-go-round

This boss fight occurs on the merry-go-round after the player defeats all the Boos. The boss fight itself is the most difficult, with the player having to avoid flamethrowers, Eeries, Grand Eerie’s attacks, and Grand Eerie himself. The Grand Eerie boss can teleport and breathe blue fire similar to Bowser making it a challenge.

Theories

A common explanation on how the Grand Eerie is created is through the means of the Personalisation A.I combining the assets of Yoshi, Blargg, the Big Boo boss, and Bowser likely using the process that creates Abominations.

Anomalies
Power-ups	Fire Flower ⭑ Frog Cap ⭑ Gold Mario ⭑ Hammer ⭑ Ninja Mario ⭑ P-Wing Cap ⭑ Phantasm Cap ⭑ Purple ! Box ⭑ Rainbow Cap Switch ⭑ Safety Cap ⭑ Tanooki Cap ⭑ Umbrella ⭑ Yellow Cap Switch ⭑ Lightning Switch ⭑ Mini Mushroom
Objects	Big Bully's Key ⭑ Cactus ⭑ Special Coins ⭑ Dancing Flowers ⭑ Eternal Star ⭑ Ghoul Medal ⭑ Night Light ⭑ Poison Mushroom ⭑ Power Ztar ⭑ Special Stars ⭑ The 121st Star ⭑ Trampoline ⭑ Extra Medals
Glitches	Astral Projection Glitch ⭑ Backwards Long Jump ⭑ Cloning ⭑ Parallel Universes ⭑ Impossible Coin ⭑ Mystery Goomba ⭑ Toad's Tool 64 Star
Entities	Abominations ⭑ Big Boo's Creeps ⭑ Birthday Toad ⭑ Blargg ⭑ Bloober ⭑ Child of Big Bob-omb ⭑ Cookya ⭑ The Castle Keeper ⭑ Dry Bones ⭑ Enemy Toads ⭑ Eerie (Grand Eerie) ⭑ Discolored Enemies ⭑ Hopper ⭑ Luigi ⭑ Mimics ⭑ Mipsy ⭑ Mother Dorrie ⭑ Motos ⭑ The Mario Silhouette ⭑ Quin ⭑ Shadowy Figures ⭑ Siren of Hazy Maze Cave ⭑ Unintended Playable Characters ⭑ Wario Apparition ⭑ Wet-Dry World Girl ⭑ White-eyed Chomp ⭑ The Whomp's Fortress Creature ⭑ Youkiki ⭑ Ally With Info
Other	AI Dementia ⭑ Alternate Campaigns ⭑ Alternate Endings ⭑ Anti-Piracy Screen ⭑ Castle Living Space Anomaly ⭑ Costume Closet ⭑ Dynamic Level Arrangement ⭑ Dynamic Level Rearrangement ⭑ Internal Clock ⭑ Internal Weather System ⭑ Major Level Expansion ⭑ Multiplayer Mode ⭑ Painting Creator ⭑ Peach's Bestiary ⭑ Personalization A.I. ⭑ Qrty-unk.png ⭑ Shared Nightmares ⭑ SM64 Stop N' Swop ⭑ Silicon Graphics' Curse ⭑ Textureless Mario Anomaly ⭑ The Self-Patching Anomaly ⭑ The Shop ⭑ The "Super Mario Movie" Phenomenon ⭑ WDW Brain Diagram ⭑ Whomp's Fortress 1-Up ⭑ 7/29/1995 Build ⭑ Pre-Gameplay Changes

Enemies
Standard Release	Enemies	Big Steely ⭑ Bob-omb ⭑ Goomba ⭑ Koopa ⭑ Piranha Plant ⭑ Bullet Bill ⭑ Bomp ⭑ Thwomp ⭑ Whomp ⭑ Clam ⭑ Unagi the Eel ⭑ Mr. Blizzard ⭑ Spindrift ⭑ Boo ⭑ Bookend ⭑ Flying Chair ⭑ Mad Piano ⭑ Mr. I ⭑ Scuttlebug ⭑ Monty Mole ⭑ Snufit ⭑ Swooper ⭑ Bully ⭑ Flame Thrower ⭑ Amp ⭑ Fly Guy ⭑ Grindel ⭑ Klepto ⭑ Pokey ⭑ Spindel ⭑ Tox Box ⭑ Bub ⭑ Sushi ⭑ Money Bag ⭑ Chuckya ⭑ Heave-Ho ⭑ Skeeter ⭑ Fwoosh ⭑ Ukiki ⭑ Bubba ⭑ Lakitu ⭑ Piranha Flower ⭑ Spiny ⭑ Chain Chomp
	Bosses	Big Bob-omb ⭑ King Whomp ⭑ GoombossDS ⭑ Big Boo ⭑ Big Mr. I ⭑ King BooDS ⭑ Big Bully ⭑ Eyerok ⭑ Big Chill Bully ⭑ Chief ChillyDS ⭑ Wiggler ⭑ Bowser
Anomalies	Enemies	White-eyed Chomp ⭑ Rex ⭑ Bloober ⭑ Eerie ⭑ Buzzy Beetle ⭑ Metal Parasite ⭑ Shy Guy ⭑ Blargg ⭑ Angry Sun ⭑ Small Chill Bully ⭑ Youkiki ⭑ Dry Bones ⭑ Hopper ⭑ Motos ⭑ Enemy Toad ⭑ The Prisoner ⭑ Discolored Enemies ⭑ Mimic ⭑ Abomination ⭑ Slaargh
	Bosses	Grand Eerie ⭑ Mother Dorrie ⭑ Junker ⭑ Big Motos ⭑ Alternative Bosses ⭑ Castle Keeper ⭑ Hammer Bros. ⭑ Gold Mario