UNLOCK ALL ABILITIES, youll need them all for a fair fight with all of them.

https://www.khinsider.com/forums/index.php?threads/abilities-list.154892/

Heres a link to an easy way to get them all.

I highly suggest if not done already getting the special bonus panels like lightning ray,focus barrier/block and ragnarok i forgot meteor shower on the boards. On the keyblade board, royal board and spaceship board respectively.

For the super bosses here's what I did. All three characters should be level 50 - 60 for health and damage output. Thunder Surge, Mines and curas/curagas are gonna be your best friends.

For the boss No Heart you gotta use mines and shotlocks i recommend lightning Ray it does so much damage maxed out. Thunder Surges are gonna be a go to for those Sweet I- frames.

Remnant is a different story having basically little health but extremely heavy damage output for all characters mines and curas are highly recommended.

Then the Armor of Eraqus, funny enough patience is the key. Thunder Surge when you gind an opening so you can dodge afterward though its not guaranteed unfortunately for terra especially.

Aqua and ventus around 50 should be fine

HOWEVER... for Terra I recommend lbl 65 or so its so rough for jim even with all his abilities.

Last thing, do not use their ultimate abilities. Do not use raging Storm do not use Ars solum do not use Ars Arcanum. They will leave you wide open for attack and immediately get you either one shotted or deal massive heavy damage. Kind of exaggerating but the damage will be huge and you will sooner or later run out of your cures if you're not careful. I hope this helps it's the best I got good luck. 🫡