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C-19, C-20 and C-22 are the 3 hard stages in Critical Cascade. Without challenges, any full 5* team should be able to sweep through. But clearing these stages with 3 challenges is tough. This video shows how you can clear C-20 with 3 challenges on.

For C-20, the 3 challenges are:
- Enemy Atk/Hashrate +67%, HP +167%
- Enemy Damage Boost +20%, Physical/Operand PEN +500
- 30% chance to fail to inflict debuffs on enemies

The first one is required, the second one hurts quite a bit, the last one is pretty non-existent for the most part.

If you need to watch this video to learn how to clear C-20 with 3 challenges, you probably will need all non-infinite Survival Strategies maxed at the very minimum. If possible, stack some of the infinite +Atk or +Crit Dmg. Every extra bit of damage helps here.

Even with all the Survival Strategies stacked up, you will need one of the following:
- a dedicated team that can burst down Odette from 100% HP to 0% HP. Not every team can do this
- 2 different combat teams to take on Odette. The first team with functions will deal most of the damage, and the 2nd team, deployed in later turns, will clean up

This example clear
- kills every single enemy on the map. It's not required, but uh, I like killing Entropics. Imma wipe out all of them
- one-team clears Odette on Round 7

Odette has a stupid amount of HP, and extremely fat stats that makes her tanky beyond belief. She also has a few skills that make her difficult to handle:
- Annihilating Featherbolts. Odette flies up in the air and starts throwing feather blades at one of your dolls. Targeting is random, and these blades do 1-tile AoE damage. Therefore, spread out your dolls and not put them next to each other. When Odette is airborne, only ranged units (and Vee) can hit her. Therefore, make sure your team has at least 1 ranged unit.
- Corrupted Paradise. Odette turns some of the tiles on the map into corrupted tiles. These tiles will damage any dolls that are stepping on them. To counter this, you will need to use the Teleport tactical skill to move your ranged dolls away from the corrupted tiles. You will die without the Teleport
- Reaper's Black Wings. During this period, Odette will have a kinda fat HP shield. If you burst down this HP shield before the skill period ends, Odette loses roughly 10% of her max HP. If you fail to burst down the HP shield, Odette will deal damage to all of your dolls instead.

So, how do you win the Odette fight with 3 challenges? Simple. You will need to burst down every single Reaper's Black Wings HP shield. She will cast Reaper's Black Wings exactly 3 times before you die to her Featherbolts at 100% Overload. In order to kill her before the Featherbolts at 100% Overload, you will absolutely require the 30% max HP damage from destroying all 3 Reaper's Black Wings HP shields. This is the benchmark that determines if you have the DPS to one-team clear Odette or not.

To defeat Odette, you will need dolls that are good single target attackers. No, Clukay is not one of those. Sockdolager receives special mention for this stage. Her ult increases the Atk Spd of every doll, which is very useful to burst down the Reaper's Black Wings HP shields.

My Team 1 one-team clears Odette:
- 5* Level 70 Vee
- 5* Level 70 Daiyan Arma II
- 5* Level 61 Persicaria
- 5* Level 61 Willow
- 4.5* Level 60 Sockdolager
- 4.5* Level 60 Millau, replaces Willow in all non-boss fights

My team 2 is as follows:
- 4* Level 60 Bonee
- 4* Level 60 Souchun
- 4* Level 60 Centaureissi
- 4* Level 60 Mai
- 4* Level 60 Fresnel
- 4* Level 60 Jessie

The tactic is simple: the Odette team takes almost every single fight on this map. Without healing and functions, Team 2 can only take 2 Basic fights, where I sack one Guard on each fight. Team 2 then becomes an AP dummy for the rest of the attempt, where they open function chests, use buttons and access the shop.

I could do one of the following:
- use the heal nodes to heal up Team 2 so that they can take more fights
- let Team 2 collect functions
However, I need my Odette team to be as strong as possible, so Team 2 gets nothing. All functions and coins will be invested into the Odette team.

For functions, I use the following functions on my Odette team:
- +Atk (required)
- +Atk Spd (required)
- +Crit Dmg (required)
- +Hashrate (useful for Persi healing + Vee ult)
- +Skill Haste (highly recommended)
- Additional Derivative Physical Damage dealt with each normal attack (pretty useful)

Refer to the pinned comment for the combat techniques that I used during Odette's fight.

If you have issues replicating this attempt, try this minimal version instead: https://youtu.be/PWBkxUYqYHQ

Timestamps:
0:00 - Start
0:15 - Round 1
2:45 - Round 2
13:26 - Round 3
18:18 - Round 4
20:40 - Round 5
24:20 - Round 6
27:40 - Round 7
29:44 - Functions Review
29:55 - Odette Malding
48:27 - Odette Clear
51:36 - Damage Stats
53:00 - Survival Strategies