There's no real trick to it. Just level up, get better gears, and dump your high damage skills at it. It is immune to stuns, and poison doesn't seem to work, but Kano's defense debuff still works, so may be good to use that in turn 1.
I'm only a bit further than you in terms of progress, but I don't think they play much of a role at this point in the game. The stat increment doesn't scale anyway, and at chapter 5 a single weapon upgrade matches the bonuses from like 10 eradication bonuses.
What was your strategy to defeat that boss? I reached him as well but his strong aoe rips me! I dunno what to do!
Yeah, some stats are certainly harder to get, though what I meant is overall the impact isn't that big on the combat. Hitting once at a slightly higher damage and hitting twice at a slightly lower damage (with the tradeoff of slightly lower skill damage) doesn't really change the course of the battle much. You're still going to clear normal battles within a couple of turns, and bosses are still gonna take a while to whittle down.
Keep battling. I don't think skills gained by a number of battles automatically unlock after that number is reached. It seems that you still need to depend on RNG for the skill to unlock after a fight. It took forever for me to unlock Yuragi's Seismic Wave and Charlotte's Eruption in chapter 5 even though I used their previous versions a lot, while Platina's Robheart upgrade unlocked fairly quickly for me.
You need to progress until you reach Dark City and they allow you to climb over the pipes!
