No Plan A is the 1st stage of Clionel Ascendant. Next stage: New Testament.
RUSH STAGEThe classic answer is the Awakened Bahamut Chain — stacking ranged attackers is exactly what the sniper boss and Angel pushers punish.
Cruel Angel Clionel outranges everything you own — Long Distance to 1,200 means there is no safe distance to stand at.
- Her blind spot is inside 400 range. The Trolly Bloggers and Angelic Sleipnirs exist to keep you out of it.
- Stacking ranged attackers is the trap here — they die at range without ever landing a hit.
- 2.4M HP makes this a long fight, so bring units that survive a 32,000 area hit rather than ones that try to out-trade it.
AWAKENED BAHAMUT CAT S Awakened Bahamut Cat - Bahamut, being a fast rusher with massive DPS at the cost of range and health, is the essence of many strategies as he'll be their main damage source, whether against Clionel or the peons. 
ROCKER CAT A Artist/Ramen Cat - Since most enemies here are Angels, Artist's singular knockback, high health and resistance against them make him more than ideal for this particular showdown. If you have his True Form, even better. 
CRAZED GIRAFFE CAT S Crazed Giraffe Cat/Maglev Cat - As supplementary rushers, Crazed Giraffe and Maglev can both take advantage of their extreme speed to pin Clionel and inflict extra damage. 
MAGLEV CAT A Crazed Giraffe Cat/Maglev Cat - As supplementary rushers, Crazed Giraffe and Maglev can both take advantage of their extreme speed to pin Clionel and inflict extra damage. 
CLEANERBOT CAT A Cleanerbot Cat - Cleanerbot's impressive health for its low cost, high speed, singular knockback and immunity to Knockback/Slow greatly aids rush strategies. 
CAN CAN CAT A Can Can Cat - Can Can Cat is a powerful single-target attacker with huge damage at close range. Primarily useful against Angelic Gories, with Extra Money and Move Speed Up Talents allowing it to get even more value for its low cost. 
JULIET THE MAIKO A Juliet the Maiko - With Speed Talents, Juliet becomes a better version of A Gift of Cats here, having a full second longer Freeze and a 10% higher chance of Freeze activation. 
FISHMAN CAT A Fishman Cat - Fishman is a fast all-purpose rusher that can be effective in infiltrating Clionel's blindspot. 
KALISA A Kalisa is a fast rusher with massive damage to Angels and full backswing attacks. She can fit inside Cruel Angel Clionel's blind spot and nuke the Angelic Gories in no time flat. She is thus ideal for accompanying Bahamut in the chain. 
KASA JIZO S Fast, spammable and deals massive damage to Angels. He can easily keep the Angelic Gories at bay and shoot down Clionel if he makes into her blind spot. 
IZ THE ALLURING DANCER S Iz the Alluring Dancer - Just like in other advent stages, her ability to tank and deal ridiculous damage helps a lot in this stage. ⚙ Trait counters worked out from the roster — not the plan on this stage, kept for reference
Cruel Angel Clionel is Angel. Anti-Angel units take less damage and deal more.
Cruel Angel Clionel reaches 600 range. Units that out-range it can chip safely without taking hits.
Cruel Angel Clionel has a deep HP pool (2,400,000+ 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. 
KASA JIZO S Its castle forms hit for enormous area damage to crack Dark/Angel bosses. Also fits “Counter Angel.” 
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 “Counter Angel.” WIKI PICK = listed on the stage's Battle Cats Wiki page; COMMUNITY = found by title, channel and date. Neither is verified by Claws' Den. Nothing loads from YouTube until you press play. Find more on YouTube ↗
The castle you destroy to clear the stage.