River Acheron Stages

River Acheron is a set of special stages that appears on the 11th, 12th, 25th and 26th days of every month. It is unlocked after clearing River Styx. The first stage yields 1 million XP when first completed, while the second stage drops the True Form of Express Cat, Bullet Train Cat.

List of Stages

Wrath of Carnage (Deadly) (has restriction of Normal, Special, Uber Rare and Legend Rare only)
Revenge of Carnage (Merciless)

Appears

Japanese Version

The 11th, 12th, 25th and 26th days in any month
First appearance: April 25th, 2019 to April 26th, 2019

English Version

The 11th, 12th, 25th and 26th days in any month
First appearance: May 25th, 2019 to May 26th, 2019

Reference

https://battlecats-db.com/stage/s01199.html

Awakening Stages

Stages
Actress Awakens!	Taking the Stage (Veteran) • Taking the Stage (Insane)
Kung-Fu Awakens!	Path of Kung-Fu (Expert) • Path of Kung-Fu (Insane)
Mr. Awakens!	Mr.-ious Evolution (Expert) • Mr.-ious Evolution (Insane)
Bondage Awakens!	Bound to Evolve (Expert) • Bound to Evolve (Insane)
The Dom Awakens!	Whipped into Shape (Expert) • Whipped into Shape (Insane)
Box Cats Awaken!	Boxing Clever (Expert) • Boxing Clever (Insane)
Panties Awakens!	No Frills Evolution (Expert) • No Frills Evolution (Insane)
Tricycle Awakens!	Hell on 3 Wheels (Expert) • Hell on 3 Wheels (Insane)
Ninja Awakens!	Way of the Ninja (Veteran) • Way of the Ninja (Insane)
Zombie Awakens!	Shambling Along (Expert) • Shambling Along (Insane)
Samurai Awakens!	Way of the Samurai (Veteran) • Way of the Samurai (Insane)
Sumo Awakens!	Oh Yokozuna! (Expert) • Oh Yokozuna! (Insane)
Boogie Awakens!	Boogie Up (Expert) • Boogie Up (Insane)
Skirt Awakens!	Skirting Danger (Veteran) • Skirting Danger (Insane)
Adult Cat Awakes!	Growing Up (Expert) • Growing Up (Insane)
Evil Cat Awakes!	Something Wicked (Expert) • Something Wicked (Insane)
Doll Cat Awake!	Dolled Up (Expert) • Dolled Up (Insane)
Maiden Awakes!	Order Maiden (Expert) • Order Maiden (Insane)
Koi Awakens!	Carp A Diem (Expert) • Carp A Diem (Insane)
Bride Awakens!	Bridal Blues (Expert) • Bridal Blues (Insane)
Vacation Awakens!	End of Holiday (Expert) • End of Holiday (Insane)
Vengeance Awakes!	No Need to Curse! (Expert) • No Need to Curse! (Insane)
Kung-Fu X Awakens!	Old Master (Expert) • Old Master (Insane)
Sports Day Awakens!	Sweat and Tears (Expert) • Sweat and Tears (Insane)
Salaryman Awakes!	Nine to Five Fever (Expert) • Nine to Five Fever (Insane)
Reindeer Fish Awakens!	Reindeer Road (Expert) • Reindeer Road (Insane)
Maniac Stages	Deathhawk (Deadly) • Vulcanizer (Deadly) • Unjust War (Deadly) • Muscle Party (Deadly) • Lots O' Lion (Deadly) • Forest Beasts (Deadly) • Ogre Island (Deadly) • Draconian (Deadly) • Resident Feline (Deadly)
Li'l Stages	Tiny Meows (Deadly) • Tiny Will (Deadly) • Tiny Chopper (Deadly) • Tiny Creeper (Deadly) • Tiny Horns (Deadly) • Tiny Wings (Deadly) • Tiny Fins (Deadly) • Tiny Tail (Deadly) • Tiny Fists (Deadly)
Crimson Vengeance	Wrath of R-Cyclone (Insane) • Revenge of R-Cyclone (Deadly)
NEO Darkness Heaven	Wrath of B-Cyclone (Insane) • Revenge of B-Cyclone (Deadly)
Peerless Too	Wrath of W-Cyclone (Insane) • Revenge of W-Cyclone (Deadly)
Wrath of the Divine	Wrath of A-Cyclone (Insane) • Revenge of A-Cyclone (Deadly)
Bitter Irony	Wrath of Titanium (Deadly) • Revenge of Titanium (Deadly)
Dimension of Delirium	Wrath of Black Hole (Deadly) • Revenge of Black Hole (Deadly)
Red Sky at Night	Wrath of Red Sky (Deadly) • Revenge of Red Sky (Merciless)
The Dead Keep Rolling	Wrath of the Unholy (Deadly) • Revenge of the Unholy (Merciless)
The 3rd Dimension	Revenge of the Wormhole (Merciless) • Wrath of the Wormhole (Merciless)
Typhoon Nihil	Creation's Gyre (Merciless) • Extinction's Vortex (Merciless)
Clionel Dominant	New Testament (Deadly) • A Cat Screaming Love (Merciless)
River Acheron	Wrath of Carnage (Deadly) • Revenge of Carnage (Merciless)
Queen's Condemnation	Honey Drip (Deadly) • Royal Jelly Hell (Merciless)
Dead by Encore	Prisoner's Progress (Deadly) • March to Death (Merciless)
King Wahwah's Return	Revenge of N-1 (Merciless) • Wrath of the Dogelord (Merciless)
A Deeper Dream	Wrath of the Dreamer (Deadly) • Revenge of the Dreamer (Merciless)
Droid Awakens!	ParaDroid (Expert) • ParaDroid (Insane)
Kerihime Awakens!	Road to Kerihime Evolution (Expert) • Road to Kerihime Evolution (Insane)
Sleeping Beauty Awakens!	Road to Sleeping Beauty Evolution (Expert) • Road to Sleeping Beauty Evolution (Insane)
Healer Awakens!	Healer Awakens (Expert) • Healer Awakens (Insane)
Merc Awakens!	Merc Awakens (Veteran) • Merc Awakens (Insane)
Titi Awakens!	Titi Awakens (Veteran) • Titi Awakens (Insane)
Singer Cat Awakens!	Road to Singer Evolution (Expert) • Road to Singer Evolution (Insane)
Takuya & Yuki Awaken	Takuya & Yuki Awaken! (Veteran) • Takuya & Yuki Awaken! (Insane)
Castle & Dragon Awakens!	Swordsman • Horsemen Cavalry • Ashura • Battle Balloon • Dragon Rider • Pretty Cat • Cyclops • Golem
Walpurgisnacht	The Stagebuilding Witch (Deadly)
A Fake Mitakihara	The Nutcracker Witch (Veteran) • The Nutcracker Witch (Merciless)
Gudetama Cat Awakens!	Road to Gudetama Cat Evolution (Veteran) • Road to Gudetama Cat Evolution (Insane)
Holy War: Saber Alter	Consumed by Shadow (Veteran) • Consumed by Shadow (Deadly)
Prof. Wild's Challenge	Willing Sacrifice (Veteran) • Willing Sacrifice (Deadly)
The 10th Angel Strikes!	Refusal Type (Hard) • Refusal Type (Merciless)
Unit-13 Strikes!	It's Not Your Fault (Veteran) • We'll Meet Again (Merciless)
Devilish Illusion	A Tower Piercing the Sky (Hard) • A Tower Piercing the Sky (Insane)
Yamato Awakens!	Inherited Ambition (Veteran) • Inherited Ambition (Deadly)
Hikakin Awakens!	Phoenix Dance (Easy)
Kaohsiung Rapid Transit Orange Line	Xiziwan • Yanchengpu • Beautiful Island • Weiwuying • Dadong
Nekondo Awakens!	Nekondo Awakens! (Normal)
Flower Cat Awakens!	Bloomin' Brightly (Easy)
Cat Kart Awakens!	Kartopia (Expert) • Kartopia (Insane)
Catburger Awakens!	Value Ordeal (Normal)

Enemies

Beefcake Cat • Dancer Cat • Hyper Mr. • Ultimate Bondage Cat • Dark Lazer • Heavy Assault C.A.T. • Lollycat • Unicycle Cat • Flying Ninja Cat • Skelecat • Pastry Cat • Riceball Cat • Gato Amigo • Loincloth Cat • Prisoner Cat • Gentleman Bros. • Nyalladin • Wrestling Cat • Madam the Savannah • Kiss and Koi • Call Center Cat • Kite Cat • Iron Claw • Rampage Cats • Ritual Cat • Xmas Pudding Cat • Manic Mohawk Cat • Manic Eraser Cat • Manic Dark Cat • Manic Macho Legs Cat • Manic Lion Cat • Manic Flying Cat • Manic Island Cat • Manic King Dragon Cat • Manic Jamiera Cat • Li'l Mohawk Cat • Li'l Eraser Cat • Li'l Dark Cat • Li'l Macho Legs Cat • Li'l Lion Cat • Li'l Flying Cat • Li'l Island Cat • Li'l King Dragon Cat • Li'l Jamiera Cat • Sakura Android • Wedding Kerihime • Eternal Sleeping Beauty • Mega Cat EX • Healer Cat CC • Merc & Cat CC • Titi Cat CC • Takuya and Lovely Yuki • Gudebene Cat • Mukyakin • Nekondo SP • Cat Kart P • Value Meal Cat