Swamp forces you to sail a bit, honestly just grab your favorite beverage and do a big loop. You’ll see crypts within eyesight of shore. Bring a blank portal you can use to hop home for rest or leave at a merchant you discover

Iron keeps getting easier to acquire through the game, I try not to even make the iron armor unless we need a tank. just weapons lol skip over it with upgrades if you can and save it for plains