You can alter the team but keep the nursefathers and atleast 2 apperantices and make sure the team can activate burn-bleed-poise fusion gifts

You can get SP fatigue if you want to but I suggest not.
Only Skill replace with Ryoshu (4 s3, 1 s1 and s2)

before floor 15 get: lunar memory, both slash tier 4s, every status t4(rock ones arent needed, and except thrill(youdontneedit)), targetted gifts, team fusion gifts, Ryoshu skill replacement:1-1-4, themepack-exclusive gifts.
enchance your gifts at floor 9-10 and before enchancing your gifts get: Rebate Token(20% chance of refund), Renewed Merch(-30% Enchance Cost)

If you start struggling before the execution you should use the team fully without trying to kill the team(except the nursefathers other than riensang)(it will still activate 2/3 status fusions)

Use tracking mode for an easier time

good luck

MAKE SURE TO GET THE "Magical Girl's Lovely Gift" if you're going to use 4th march flame corrosions on the execution turn

collect ego gifts...

you can sacrifice all after getting the "spiderweb entangled in red" but you'll need to revive them later on if you want to do the highest damage stuff

While getting pack exclusive gifts also try to get lunar memory, after getting it get both slash tier 4's and get every status tier 4 ego gift(you dont need the rock ego gifts)

if you get a secret boss try using the full team and activating the fusion gifts

Order I suggest you take these:
1st Line 3
2nd Line 5
3rd Chachihu
4th Bearers of Weight

Chachihu and Bearers of Weight give the Ego gift on floor clear
and the other 2 you should get them in the pack or the rewards
make sure to get the 5 ego gifts listed before floor 15

if you miss some it is alright.

if possible take Bridle of Infinity

if it isnt possible you can take Line 1:MADNESS as well!

1. start the encounter with the deployment order given.
2. kill HoS allies with defense skill and enemy skills, be carefull to not kill mersault or heathcliff
3. after some allies die the next turn the burn fusions should be active.
4. when all fusions become active kill every ally except ryoshu(also use skill 1 and 2 atleast once)
5. once all allies die wait until ryoshu gets 7 slots

The Turn Before Execution
Do this if you dont have 4th march flame

Do not do 7 wrath a-res, win many clashes as possible

And Do this if you have it

after use no skills except 4th march flame and great trichiliocosm(Use great trichiliocosm corrosion first and after 4th march flame corrosion)
hopefully get 4-6 corrosion egos and use them with Rusty Commemorative Coin for an extra use (you should be at 25ish sp if you got the gift from hate and despair next turn)

The Turn of Execution

• get 7 wrath a-res (this will give: +5 final power and +2 coin power)
• use IRA and MOROSITAS(optional but will effect quite)
• make sure Rend Space-Echoshear is hitting 3 enemies

if you got valencina secret boss make sure Rend Space-Echoshear clashes with atleast a 2 coin skill(for +1 coin power)

start
and you'll get a huge amount of damage