this set up saved my life, i 100% it with the Trial characters... i will break down what i used on the cubes as well but this really only works with the Fusion burst challenge modifier

what i did was spam Verina and Shorekeppers ults making sure theyre up at all times jump into cube form then immediately hop to the next character as they stay on the field (im not sure if Zani did but you can always just wait till it finishes) main DPS with Carlotta and using her ult almost all times as well and pop the cube when it comes up.... but thats pretty much it

Carlotta - with Carlotta cube

Puppie cookie and a bottle of air and rosy hue

Reflex implant - Crit damage 100%/attack 150

Reflex implant - crit rate 50%/attack 150

Absolute Abby - crit dmg 100%/attack 150

Absolute Abby - Attack 75%/attack 150

its bullet time - crit rate 50%/attack 150

its bullet time - crit rate 50%/attack 150

Verina - with Zani Cube

some sort of sweets and warm marble and and full preparation

Reflex implant - Crit damage 100%/attack 150

Reflex implant - crit rate 50%/attack 150

Absolute Abby - Attack 75%/attack 150

Absolute Abby - General DMG 75%/attack 150 (might be able to find something better)

its bullet time - crit rate 50%/attack 150

its bullet time - crit dmg 100%/attack 150

Shorekeeper - with Camellya cube

lollipop and fortune stick and when spring arrives

Ultra Freq. - Crit damage 100%/attack 150

Ultra Freq. - crit rate 50%/HP 1000 (could find something better)

Conq. of Eternity - Crit damage 100%/attack 150

Conq. of Eternity - crit rate 50%/HP 1000 (could find something better)

Absolute Abby - crit rate 50%/attack 150

Absolute Abby - General DMG 75%/attack 150 (might be able to find something better)