Dragon Spinel after Depth 21 is tough

Strategy for those who can't meet the cost limit (might be possible if you can keep collecting Torchlights from each inn) Equipping the Alaclatro core seems to inflict confusion before the barrier activates, allowing safe attacks. If confusion doesn't hit, I use the Awakened Mikazuchi core to deal with Zazanpa. My progress is weak, so King Emerald seems even scarier, which is frightening. It's also a pain not being able to heal mid-way... Apparently, you can retry battles by task killing. I found out that Majastis from Laplas's staff, which I don't have, is also apparently good.