Omg dude the final battle with Destan is hard af but i managed to get it. Basically:
- You can't defeat Destan just by attacking him, he has a shit ton of hp (9999999 to be exact)
- Learn Destan's attack pattern, it's repeating
- Defeat Tama because you can't attack Destan while it's in there
- For the final phase (Where Destan says he will show his full power):
1. Use Demon Lord's 'Divided By' skill so Destan attacks last
2. Use Sapphire's 'Blind Spot' skill so Destan only targets him
3. Use Alice's and Demon Lord's 'First Imperial Decree' skill on Destan and Sapphire's 'Reflection' skill so Destan's attack bounces back to him. (You have to time the attack carefully based on Destan's attack pattern)
Basically, you have to hit Destan with 3 First Imperial Decree attack. (Two from Alice and Demon Lord, One from Sapphire reflecting Destan's First Imperial Decree)
I'm not sure if it's understandable enough. The battle is already frustrating for me. I'm too lazy to give a full guide so lmk if y'all want it.