Mournmurus Boss Butch!
Mournmurus is a door boss in the mod "Boss Butch!", and it can be only found in the 
Gehenna floor.
Behavior
Mournmurus as a wall it only can move down the room chasing player and doing attacks:
- After a short yell, eyes wake up form both sides of a room. They will shoot bloody projectiles similar to Wall Creep.
- Door fires a harder version of Mega Blast similar to Mega Satan. However it stays longer and red projectiles are spreaded from the beam to both sides of a room.
- Door spits out some spiky balls ahead of player and camera. They stay until, they are destroyed by having contact with Mournmurus. When they are destroyed, eight spiky projectiles are shot around the ball.
There are skeletones sticking out of the Mournmurus. They shoot bone projectiles in player's direction only in two attacks:
- A chain goes through left or right wall and sticks in the other one. Chain doesn't move so as Mournmurus goes down, chain is closer to player. When it close to boss, chain is pulled back and some rock projectiles fires from the hole where spiky end of a chain was stuck. Durnig this attack, skeletons shoots three bone projetiles as if they have The Inner Eye. Both don't shoot at the same time.
- While Mournmurus fires a wall of shady projectiles for half a width of a room, skeleton from the second half fires four bone projectiles as it has Mutant Spider. Attack repeats several times and sides of it changes.
Notes
- While Mournmurus is moving down, camera is also moving.
- As health of Mournmurus decreases, the boss speeds up.
Lore
Mournmurus is a cursed wall which harvests the souls of unsuspecting victims who mistake him for the door to the 
Boss Room. Anyone who draws near will be quickly pulled into his chamber, at which point there is very little hope of escape as their spirits are harvested for his collection.
Trivia
- Mournmurus is a combination of two words: English "mourn" meaning to feel sorrow for the death of someone and Latin "murus" meaning wall.
- After fight Mournmurus' door can be opened with Dad's Key. Inside there is a special room with an item inside.
Gallery
Mournmurus in game during fight.
Mournmurus trying to suck Isaac into his chamber.
Mournmurus' mega blast attack.
Open eyes after Mournmurus' yell.
Drawing of Mournmurus in the Bestiary and on Isaac's last will.
Mournmurus's health bar icon if Enhanced Boss Bars is installed.
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