This is a sub-page of Bloodborne.
Father Gascoigne#
The bossfight in the alpha remains mostly unchanged but with slight details. In the alpha Father Gascoigne's boss display name changes from when he transforms into a beast:
ガスコイン神父 - Father Gascoigne
to
ガスコイン神父(獣)- Father Gascoigne (Beast)
Gascoigne's pistol shots could also destroy the tombstones. Gascoigne's model has some lighter texturing indicating that it may have been unfinished at the time.
Alternate Moon Prescence#
The secret final boss of the game had a larger body and used tentacles to attack. Via a Chalice Dungeon glyph (be sure to back up your save before trying the glyph: sikgc3sm) this fight is accessible but is very unfinished. Falling into the void behind the boss hallway returns you to the Hunter's Dream. 
Ghost Moon Presence#
In the files there is a Moon Presence that looks completely ethereal, it was possibly used for a cutscene that no longer exists. It is also unknown what cutscene that this Moon Presence takes place in, it is most likely in the Hunter's Dream. 
Saint Laura#
Shots in trailers indicate that both the Cleric Beast and Ebrietas were in Amelia's position at the Grand Cathedral during development. Amelia herself was in Hemwick Charnel lane in a place called the "Witches Abode", Amelia's early name was Saint Laura.
Snake Ball#
The Snake ball is a giant intertwined group of snakes that was replaced by the Shadows of Yharnam. It has large cyst covered heads that bite the Hunter and then tosses them around. This is more appropriate given the name of the forest is the Forest of Snakes. This boss has been restored in some capacity here.
King in Blue#
King in Blue was the King of Cainhurst and was cut for unknown reasons. This boss had multiple forms, and carries seemingly a Zweihander, it is also possible this was a common enemy.
Provost Willem#
Willem at one point was one of or the only boss at Byrgenwerth. He seemingly wanted the Hunter to search for eyes and at the end of this seemed questline he would want the Hunter to become his sacrifice. He would then become hostile and then attack. He would cast magic and also have eyeballs surrounding him to attack. During this he would speak in tongues, seemingly elevated in thought somewhat, following is a showcase here.
Great One Beast#
The Great One beast is a very large quadruped beast with electric power. It is extremely agile and is able to get around whilst attacking with no issue. This boss has been completely restored and showcased here.
Lady Maria#
Concept art indicates that Maria's 2nd phase had a more ghastly transformation. The transformed state resembles the Pthumerian Chalice Dungeon bosses.
Knight and Stead#
A Knight like boss with an untextured model (with the exception of his helmet) along with a halberd weapon (with banner attached) and with a model for a horse that he would ride. The helmet has a mild resemblance to the Penetrator boss of Demon's Souls, a beard of sorts flows out from under the helmet indicating that the Knight is extremely old, the armor has some arrows sticking out of it, and most distinctively the Knight has a peg leg which connects to the Cainhurst Knight motiff of losing their right legs. 
Creeper#
One of the stranger unused bosses, a feather-winged fire demon with a second head embedded in its side and wielding a large gnarly axe. It is completely unknown what location this boss was used in. It seems to look this way due to the changing interpretation of Demon's in the collective unconscious. The fog most likely summoned it. 
Lesser Demon of Death and Darkness#
This is actually just the Wet Nurse, her name and purpose entirely changed. She was a dream demon, she also is Iosefka, the early version, but when the transformation takes place is unknown. The spiders in Mensis are actually "Devotee of Death and Darkness" suggesting a cult around the Demon was constructed.
Amygdala#
At one point, Amygdala was the final boss. If one has a good eye, it will be more than obvious Amygdalae already have an important place in Yharnam. In the Grand Cathedral, there are many Amygdala statues lining the way to the sanctum. There is also many Amygdalae imagery in Yhahar'gul. The internal name for Amygdala is "False God" which implies much.
Boss Name Switches#
Name |
Name Change |
|---|---|
Kos |
Ebrietas |
Ebrietas |
Moon Presence |
Ebrietas |
Kos |
Amygdala |
God's False Angel |
Rom, The Vacuous Spider |
Rom, The Idiot of the Moon |