HARDEST BOSS IN THE GAME ?! The Binding of Isaac (16)
Delirium is a boss added in The Binding of Isaac: Afterbirth †. It is the main boss of The Void and the final boss of Ending 20.
Delirium's main form is stationary but teleports erratically around the room and performs the following attacks:
Continuously sends out various overlapping patterns of white projectiles for the entire duration of the fight:
20 projectiles that slowly rotate clockwise or counterclockwise while expanding.
16 projectiles outwards in all directions.
14 projectiles that rotate clockwise, counterclockwise, or back and forth while expanding.
10 projectiles that fluctuate in and out while expanding.
8 slow-moving green-tinted Ipecac projectiles in all directions.
6 projectiles that travel outwards in a zig-zag pattern.
4 projectiles outwards in a lop-sided cross.
4 lines of 3 projectiles that spiral outwards.
A spread of 5 projectiles in Isaac's direction.
A burst of projectiles that travel outwards in random directions.
A stray short-range projectile in a random direction.
The projectile size per each attack is random and varies from very small to moderately large.
Transforms into bosses previously encountered during the run, which can include major bosses such as Mom or It Lives.
When it transforms into a boss, Delirium retains its own health, not the health of the boss it transformed into.
When transforming into certain multi-phase bosses, such as Isaac, Delirium copies the phase that that boss would be at, given its current health percentage.
When transforming into a segmented boss, only the first two segments share Delirium's hp; the other segments have separately generated hp and can be defeated separately.
It can rarely transform into two or even three bosses at once.
It can also rarely spawn a separate copy of the boss it transformed into.
Whether it turns into a Champion variant or a regular variant is random and does not depend on which variant was previously defeated.
Removed in Repentance It is unable to properly transform into Hush's true form. In order for this to happen, very few bosses must be encountered in the run. Additionally, many of Hush's attacks do not work properly and the sprite is also unfinished.
Added in Repentance Can transform into Added in Repentance Baby Plum, Added in Repentance Bumbino, Added in Repentance Reap Creep, and Added in Repentance The Pile, but only Baby Plum has a unique sprite. Cannot transform into any other Repentance bosses.
Added in Repentance Cannot transform into Mega Satan, rendering its unique sprite unused.
Occasionally, it returns to its main form to perform projectile attacks at a faster pace.
As it takes damage, it becomes more aggressive: moving, teleporting, transforming, and attacking at a faster rate.
It also takes on a reddish hue to signify this change.
Destroying non-Delirium segments when he transforms into segmented bosses can also temporarily trigger this effect.
If Delirium is being dealt damage at a significantly high rate from multiple tear sources, he will attack, teleport, and transform at extreme speeds.
Upon defeat, the screen starts to glitch, fills with static, and the room switches between different environments, while short scenes from the current run are played ending with Delirium screaming and bursting into a small puddle of blood.
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