Dragon Quest VI: Realms of Revelation/The Fungeon
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The Fungeon, Part 1
The Fungeon's battles are actually incredibly easy. Walk into them with a party of Dragons (to increase pre-emptives), put everyone but Carver away once you get one, use the Spear of Gracos (with Meteorite Bracer)... then have him spam Forbearance as the others spam C-c-cold Breath & Scorch. You will be functionally immortal, and you won't use a single drop of MP.
The Fungeon's items are surprisingly underwhelming, save for one in the "Reaper's Peak" section. As for this part, the Seed of Resilience is the only item with any tangible value. Perhaps the Mini Medals could be good, but... everything past the 70 Medal reward is either equally pointless, or can be bought in Reaper's Peak.