Where is the treasure of Wizard 3' s unsent letters?

The treasure of wizard 3' s unsent letter is in the fire port, which is a treasure hunt. We found an unsent letter on a body by the river. After reading it, we learned that the deceased was responsible for transporting a small box. I don't want the box to sink to the bottom of the river and be attacked by water ghosts. We can't fight back here, we can only avoid it flexibly. We found a treasure chest at the bottom of the river and got some blue weapons from it.

Witch 3 Wild Hunting is a role-playing game released by SpikeChunsoft. The game was released on the platform on May/9th, 20th19th, and landed on the Nintendo Switch platform on October/9th19th. The game is adapted from the novel "Hunter" series, which is the third part of the wizard series.

Introduction:

Witch 3 has some spare money at first, so try to use it. So when you see mandala and cherry wine in the hotel, you must buy them. If you have no money, you should bother to buy it. If you have enough money, try to find a herbalist to buy white five-petal herbs, then pay more attention to your backpack and buy whatever you lack.

And don't buy rune formulas, don't buy equipment formulas. This can be done according to the raiders. Your money must be used on the cutting edge. Try to buy alchemy formula. You will find that in Wizard 3, you must learn alchemy all over the world. The number of alchemy formulas is equal to your maximum toxicity, and matching skills are also equal to your damage value and viability.

When handing in the reward task, don't choose weird or other options, or your bonus will be halved. Try to collect rat grass when swimming. This is a life-saving medicine, which will save a lot of production time in the future. Explore the map more when swimming. After all, not all the relics or treasures on the map will give you a question mark.