charge bleed sinking (ring)

honestly you can pick wich one of the 2 fusion routes you go

royal jelly perfume is VERY important for this strategy

do not take anything from shop untill you have both keywordless gifts.
trying to force them is painfull

more survivability

shatterbound is quite worth it and the other 2 gifts are also nice to have

egg is optional because it really does hinder the sacrifice gimmick

another alternative route is having
The Noon of Violet at floor 3
Line 2 at floor 4
and Miracle in District 20 BokGak at floor 5 so you can also get the Gift fusion

make sure to upgrade everything before extreme

if you have enough cost left to upgrade all your gifts.
you could alternatively do line 1 for False Halo

just use like Charge Bleed for floors 1-10 (instead of [Sinclair] Los Mariachis Jefe put [Ryōshū] Lobotomy E.G.O:: Red Eyes & Penitence)

if you have any questions or something you want to point out feel free to send in a comment

once you reach extreme you can start activating all the fusion gifts
to do so you can follow the deployment order i provided and put [Sinclair] Los Mariachis Jefe specifically at slot 6 so that he gets the bonus of Royal Jelly Perfume which gives him 10 Aggro
allowing for easy turn 1 extreme encounters where he takes 90-100% of the enemies attacks to himself through the Aggro
and then you let him die which brings in [Ryōshū] Lobotomy E.G.O:: Red Eyes & Penitence to activate charge and bleed

alternatively you could run Charge Sinking + (Bleed) by having [Ryōshū] Lobotomy E.G.O:: Red Eyes & Penitence being the sacrifice instead of [Sinclair] Los Mariachis Jefe and having [Yi Sang] The House of Spiders: The Index Nursefather as #8

for the starting gifts:
Sharp Needle & Thread cause its nice
Emergency Investigator Badge for survivability
and Chief Butler's Secret Arts for Handheld Mirror. the fusion that adds stagger bars to enemies (makes ex and invaders a lot easier)

the 2 Burn gifts are for buffing closing time

if The B.E. shows up you can forego either Line 2 or Sunk Gloom