Explosion in the Sky is the 1st stage of Day of Judgement. Next stage: Acts of Cat-God.
White Cyclone (999,999 HP, 89,000 area damage, speed 7) plus two more White Cyclones queued behind it — a Floating rush that has to be controlled, not out-tanked.
- Any Floating crowd-controller makes this easy: stack Sanzo Cat from the start, supported by Eraser Cat and Fishman Cat to clear the Owlbrows and Mooths.
- The opening enemies drop a lot of cash, so high-cost units are affordable here — but keep slots free, because the Continuation stage with Divine Cyclone is the real fight.
- Alternative cheese: Awakened Bahamut plus another strong rusher can end the stage before the boss spawns. That does not work on the Continuation, so still prepare for it.
Unlike the Red and Dark Cyclones, this enemy has only one trait: Floating, making it slightly more difficult to counter. It has all the trademarks of the Cyclones, with extremely high health and attack power, very low range with somewhat low movement speed, but a lightning fast attack rate and attack animation.
FISHMAN CAT A If you have cats like Sanzo, you can just stack them up during the beginning of the stage, and support him with cats like Eraser Cat and Fishman Cat to clear the starting enemies. 
ERASER CAT S If you have cats like Sanzo, you can just stack them up during the beginning of the stage, and support him with cats like Eraser Cat and Fishman Cat to clear the starting enemies. 
SANZO CAT A If you have cats like Sanzo, you can just stack them up during the beginning of the stage, and support him with cats like Eraser Cat and Fishman Cat to clear the starting enemies. 
AWAKENED BAHAMUT CAT S Alternatively, it is possible to use Awakened Bahamut Cat, if paired with another strong rusher like Thunder Jack, to cheese the stage by beating it before the boss spawns. ⚙ More counters worked out from the roster, lower confidence than the picks above; kept for reference
White Cyclone is Floating. Anti-Floating units take less damage and deal more.
SABER THE CAT C Saber Alter Cat: Strong against Floating enemies (Deals 1.5x damage, only takes 1/2 damage) 
ARCHER CAT A Deals Massive Damage to Floating enemies. Also fits “Out-range White Cyclone.” 
BODHISATTVA CAT A Slows and (True) Weakens Floating enemies. 
CATMAN S Massive Damage vs Floating (Normal). Also fits “Out-range White Cyclone.” 
HIGH LORD BABEL S Equally tough against Floating enemies, with Colossus Slayer. White Cyclone reaches 70 range. Units that out-range it can chip safely without taking hits.
GROSS CAT A Range 350 — fires from beyond its 70. 
MASTER URIL A Range 405 — fires from beyond its 70. 
PHANTOM CAT A Range 360 — fires from beyond its 70. Also fits “Counter Floating.” 
BACKHOE CAT A Range 350 — fires from beyond its 70. 
CHILD OF DESTINY PHONO S Range 600 — fires from beyond its 70. Also fits “Burst the boss down.” White Cyclone 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. 
MIGHTY REKON KORPS S Among the highest single-hit Area damage available. Also fits “Out-range White Cyclone.” 
GAIA THE CREATOR S Long-Distance multi-hit with Insane Damage — a generalist wall-cracker. Also fits “Out-range White Cyclone.” 
CRAZED MONEKO A Big crit burst against tanky/Metal targets. 
TECOLUGA S A 7,300-AP long-range hit obliterates tanky targets when the Critical connects. Also fits “Out-range White Cyclone.” 
The castle you destroy to clear the stage.