1-7 SUN
1-7 Sun is the 7th stage of Cosmos Ch.1 — Beyond the Exosphere. Previous stage: 1-6 Mercury. Next stage: 1-8 Uranus.
The Face's Alien/Floating variant — 44,444 HP, 1,333 AP area attack at 366 range with 100% Freeze. Boss of Sun across all 3 chapters plus Sirius/Skelling Ch.3. Freeze-Immune frontline (Li'l Eraser, Riceball with Talent) + Anti-Alien/Anti-Floating Ubers.
I.M. Phace 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. 
BAKERY CAT A Curses Alien enemies. 
LITTLE LEAGUER CAT S Resistant vs Alien and Long Distance — a budget anti-Alien backliner. 
CATMAN S Deals Massive Damage to Alien in every form. Also fits “Counter Floating.” I.M. Phace is Floating. Anti-Floating units take less damage and deal more.
ARCHER CAT A Deals Massive Damage to Floating enemies. Also fits “Out-range I.M. Phace.” 
BODHISATTVA CAT A Slows and (True) Weakens Floating enemies. CATMAN S Massive Damage vs Floating (Normal). Also fits “Counter Alien.” 
HIGH LORD BABEL S Equally tough against Floating enemies, with Colossus Slayer. 
BISHOP CAT A Its Slow only lands on Floating enemies, making it a targeted answer to Floating pushers. I.M. Phace reaches 366 range. Units that out-range it can chip safely without taking hits.
LIZARD CAT B Range 400 — fires from beyond its 366. 
RED RIDING MINA A Range 435 — fires from beyond its 366. ARCHER CAT A Range 390 — fires from beyond its 366. Also fits “Counter Floating.” 
BATH CAT A Range 400 — fires from beyond its 366. CATMAN S Range 440 — fires from beyond its 366. Also fits “Counter Alien.” Metal-themed stage in the Anti-Metal cluster. Crit-chance cats (Island Cat, Crazed Fish, etc.) are essential — most damage bounces otherwise.
First Anti-Metal stage in CotC. Just Metal Doge + Metal Hippoe — no real boss. The MAX_20 deploy cap is generous; this is the 'practice' stage for the cluster. Standard loadout: Island Cat / Crazed Whale / Crazed Fish for guaranteed Crits → two-three meatshields → one ranged Crit attacker (Sniper Cat, Solar Cat) for the backline. Common failure: bringing a non-Crit lineup. Metal enemies completely no-sell raw damage; you'll bounce off them and lose to attrition. The Titanium Fruit treasure from this cluster boosts Crit damage further — collect all three superior treasures (6, 7, 8, 9) for the Anti-Metal bonus.
The castle you destroy to clear the stage.