All red background units (3rd tiers) can be obtained from that hidden dungeon and a Oda herself at a Lv35 stage, which is pretty difficult, as in unless you've been whaling you probably won't beat it. Only 3 runs each for all of them.
Unlocking that hidden area took me 3 days of 150+ runs total. I have gotten easily over 20 hooked spears, which I've had to sell because lack of space.





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