2-45 N77 NEBULA
2-45 N77 Nebula is the 45th stage of Cosmos Ch.2 — The Passion of Catgod. Previous stage: 2-44 Crimson Star. Next stage: 2-46 Andromeda.
UltraBaaBaa carries a Barrier (up to 266,000 HP) — your hits are absorbed until it's broken.
UltraBaaBaa's 266,000 Barrier needs a guaranteed 100% Barrier Breaker — chance-based units stall and waste your damage window.
FENCER CAT A Guaranteed 100% Barrier Breaker at long range — the reliable accessible breaker. 
BORA S 100% Barrier Breaker reliably cracks Star Alien Barriers. Also fits “Counter Alien.” 
LUMINA S 100% Barrier Breaker opens Star Alien Barriers for the team. Also fits “Counter Alien.” 
GRAVI S 100% chance to break Barriers. Also fits “Counter Alien.” 
KOMORI S 100% chance to break Barriers. Also fits “Counter Alien.” 
MIZLI S 100% chance to break Alien Barriers. Also fits “Counter Alien.” 
Project A is Alien. Anti-Alien units take less damage and deal more.
GROSS CAT A Its True Form is Strong Against Alien, giving budget anti-Alien value. 
LI'L GROSS CAT B True Form has a 30% Knockback vs Alien. Also fits “Break the Barrier.” 
WHEEL CAT A Deals Massive Damage to Alien enemies — a huge area nuke against Alien crowds and bosses. Also fits “Clear the crowd.” 
MITER SAW CAT A Resistant to Alien and deals Massive Damage to Alien. Also fits “Break the Barrier.” 
CATMAN S Deals Massive Damage to Alien in every form. Also fits “Clear the crowd.” Project A reaches 451 range. Units that out-range it can chip safely without taking hits.
MEDITATION CAT C Range 600 — fires from beyond its 451. 
NERD CAT A Range 1200 — fires from beyond its 451. Also fits “Clear the crowd.” 
GUNDUROS S Range 500 — fires from beyond its 451. Also fits “Counter Alien.” 
DRILLER CAT A Range 460 — fires from beyond its 451. 
MIGHTY REKON KORPS S Range 470 — fires from beyond its 451. Also fits “Clear the crowd.” 8 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. WHEEL CAT A Hits every Alien in a wide area at once, melting grouped Star Aliens. Also fits “Counter Alien.” 
SURFER CAT A Area damage hits grouped enemies. Also fits “Counter Alien.” CATMAN S Long-range Area damage clears groups. Also fits “Counter Alien.” 
ACTRESS CAT B Hits multiple enemies at once for budget crowd damage. UltraBaaBaa's 266,000-HP Barrier is the highest in the game. Anti-Alien Barrier Breakers (Bazibon line, Loincloth Cat) cut through.
Project A + UltraBaaBaa double-threat. They want different solutions: UltraBaaBaa needs Barrier Breaker; Project A needs Anti-Floating + range. Talented Crazed Bahamut covers both surprisingly well. r/battlecats consensus: dump everything front-loaded (Bahamut variants + Crit attackers for UltraBaaBaa's slow window) and accept that you'll burn one Cat Cannon. Mystery Mask treasure run for Ch.2 closes here — collect the superior before 2-48 or repeat the 30+ attempt mistake from Ch.1.
The castle you destroy to clear the stage.