I am back home and now I am stuck at the coliseum intermediate challenge.
Another dumb and obvious tip that I have missed?
For now, I can kill the first three waves by spamming Swoop Raid and Raging All, but then those butterflies and monks destroy my pace.
And then, the final boss of that stage is an overpowered first stage insect boss whose pattern I forgot.
For tips that I found.
If you chain skill combo up to 10, you will have a -3 AP discount for each skill and if you kill the enemy before ending the combo then your AP will be fully restored so you can go ham in the first rounds due to the amount of enemies, just weaken them a bit before starting skill spam. I used Swoop Raid and Raging All to get some evasion mixed. The goblins have low def and hp so you can probably start chaining combo on them.
The butteflies whose name I can't remember does a backward move and fire some wind ball. That hit like crazy, prioritize killing them.
The monks have defense, so weaken them a bit with hit and run tactics before unleashing your combo. Try to have only 1 monk at a time, but if there are 3 of them, use your super move to weaken them considerably.
When fairies comes into the battle, avoid doing aerial combos or at least have enough AP to use Rush Pierce. The reason is that they have a whirlwind move and aim the spot where you will fall down. Is the smaller version of the Gargoyle huge tornado and hit as hard as that.
The living armors are slow, you can probably use an attack and parry.
The final (I think is the final) enemy is that huge bug you faced on the forest tutorial. Use the same strategy to defeat it or at least that's what I hoped but at that point my HP is so low that I die in one single hit.
For now I will keep advancing the main story and tackle this event later, maybe I will do it once I have the mats to inherit the skill from the bugkiller sword.