Iago (DF)  

mobs drop seals dif merchents which have higher stuff you have to buy with the seals. Forget the dif seals but it tells you in the trade box thingy ingame dosent show on this screen shot They got Emerald seals diomnd seals lots of dif ones. And you use them to buy the stuff you want like if theres a 10x by it its 10 of those type of seals the higher lvl stuff, Drops the higher seals which means higher lvl armor