Seth sold his shotgun, a weapon that Mia used to fight with. However, she was already gone, so Seth didn't need to keep it.
Aside from that, he also disliked the single-shot type of weapons like the shotgun, which was ineffective for defeating monsters or a group of humans attacking simultaneously. The most effective weapon to attack them was to use multiple-shot weapons, such as a pistol or the SMG Kriss vector laser rifle that was in his hand at the moment.
The merchant was seen grasping Seth's shotgun with both hands. The man's eyes kept looking into it with care.
"The weapon's condition is still good, as well as the amount of plasma in it. If you look at the item list book, the price of this shotgun is around 15,000gp," said the merchant.
"Since this shotgun has been used, especially by someone who has died, I will value it at 10,000gp. What do you think?" the merchant asked, raising his head as he looked at Seth seriously.