3-48 THE BIG BANG
3-48 The Big Bang is the 48th stage of Cosmos Ch.3 — Even Stars Burn Out. Previous stage: 3-47 Black Hole. Next stage: 3-IN Filibuster Invasion.
Final boss of CotC Ch.3 (Traitless). 1M HP, 800-range Multi-Hit ending in 66k strike. 100% Wave (Lv.12) AND 100% Warp back 1500 range on first hit. Mystery Mask required to keep him at 100% (otherwise 1,100%). Awakened Bahamut and Maglev Cat exploit the warp resetting their backswing.
15k 
6k Kid Tappa and General GreGory carry Barriers (up to 15,000 HP) — your hits are absorbed until it's broken.
LI'L GROSS CAT B 30% Barrier Breaker. 
SPACE CAT A 50% Barrier Breaker. 
FENCER CAT A Guaranteed 100% Barrier Breaker at long range — the reliable accessible breaker. 
BORA S 100% Barrier Breaker reliably cracks Star Alien Barriers. 
LUMINA S 100% Barrier Breaker opens Star Alien Barriers for the team. 
SKIRT CAT B 30% Barrier Breaker. Final Boss Giga-God is Traitless. Anti-Traitless units take less damage and deal more.
BOWLER CAT A The Slow lands on Traitless enemies — great for stalling the many Traitless bosses across Empire of Cats and Into the Future. 
BRAINWASHED AXE CAT A Strong against Traitless and Curses Traitless enemies. 
D'ARKTANYAN S Strong Against Traitless on a Long-Distance area attack — answers the many Traitless bosses. Also fits “Clear the crowd.” 
GLASS CAT A Knocks back and Slows Traitless enemies on its Kamikaze hit. 
BRAINWASHED BIRD CAT A Massive Damage (and True Slow) vs Traitless. Final Boss Giga-God reaches 800 range. Units that out-range it can chip safely without taking hits.
Final Boss Giga-God has a deep HP pool (999,999+ even before stage magnification). Heavy single-target burst shortens the fight.
BAHAMUT CAT S Huge multi-hit burst — a story-unlock powerhouse that deletes tanky enemies. 
IZ THE DANCER S Big Multi-Hit Massive-Damage bursts. Also fits “Clear the crowd.” 
GAIA THE CREATOR S Long-Distance multi-hit with Insane Damage — a generalist wall-cracker. 
CRAZED MONEKO A Big crit burst against tanky/Metal targets. 
KALISA S Big Massive-Damage Area hits. Also fits “Clear the crowd.” 6 enemy types stack up here. Area attackers hit the whole push at once instead of one unit at a time.
VALKYRIE CAT A Hits the whole group while it freezes them. 
SALON CAT S Hits whole crowds, and is Weaken-immune so it keeps firing through Weaken stages. 
NERD CAT A Evolved/True hit groups over a Long Distance band. Also fits “Out-range Final Boss Giga-God.” 
LASVOSS S Long-range Area damage clears groups. Also fits “Burst the boss down.” 
ACTRESS CAT B Hits multiple enemies at once for budget crowd damage. CotC Ch.3 final boss. Final Boss Giga-God (Traitless, 1M HP, 800 range, Multi-Hit ending in 66k strike). 100% Wave (Lv.12) + 100% Warp back 1500 range on first hit. Awakened Bahamut and Maglev Cat exploit the warp resetting their backswing.
The endgame trial. Final Boss Giga-God has only 1M HP (less than Ch.2's Cat God!) but his Lvl 12 wave attack warps everything on the first hit and nukes on the third. The community fix: bring an Awakened Bahamut with the Explosion talent — his ~200k-damage knockbacks chain Giga-God's knockback animation, essentially locking the boss until a peon walks into Bahamut's range and breaks the loop. Required gear: Bahamut at level 30+ with Explosion talent, all Mystery Masks (43/45/47 superior), at least one anti-Floating Uber. The real killers here are Mesocosmocyclones — they push hard, stack with your Bahamut's range, and ruin your timing if you let them accumulate. Recommended lineup: Crazed Bahamut + A. Bahamut + Manic Lion meatshields + Ganglion/Twinstars for chip + a Doctor Cat to slow the wave. Considered the stage that unlocks 'real' Cosmos endgame; r/battlecats: 'if you cleared this you can stop playing the story and just go grind XP cans.'
The castle you destroy to clear the stage.