Atrocious Deco is the sixth and final stage of Grotesque Gallery.
- Berserkory spawns at the beginning.
- Razorback spawns when the base is at 90% health (1,350,000 health).
- Bun Bun Symbiote spawns when the base is at 80% health (1,200,000 health).
- Boraphim and Angelic Sleipnir spawn when the base is at 70% health (1,050,000 health).
- Crazed Cat, Crazed Tank Cat, Eraser Cat, Ramen Cat, Thaumaturge Cat, Bombercat, Crazed Fish Cat, Macho Leg Cat, Dragon Cat and Awakened Bahamut Cat.
Demonstrated video: 
Its possible to defeat all the bosses appearing all at once but a Uber-intensive strategy is required and Warlock and Pierre is needed to deal enough damage to the base to trigger all waves(Berserkory can't be killed before then)