"Well well well, just give me a moment to look over everything here and I'll tally up the cost for you." You and Buddy place the items onto Ferric's counter as he checks it over, putting on a fancy headpiece that had a built-in lens of different magnifications. Three scimitars, four daggers, two greataxes, two maces, four sets of leather armor, two sets of hide, and one set of studded leather. Most of it was in decent condition too, though they certainly needed to be washed and patched up. He'd sell the whole bulk to you for 125 gold coins total. Appraising the Slaad Gem, he is able to tell you that this is a Red Slaad Control Gem. 

"Slaads are aberrant creatures, things unlike even fey or demons. A magic ritual can be cast to create a Slaad via the gem, and as long as you possess said gem they will unquestionably follow your orders." Ferric put the gemstone in front of you as he shook his head. "That being said, I've no idea how to preform said ritual, and even if you did accomplish it, earning the loyalty of the Slaad is a trial of it's own. Compared to it's other kin, Red Slaads are actually quite affable, however they are driven by their primal instincts and have very little to no concept of human morality." Looking over to Mica, who was diligently pouring over books in his private work area, Ferric looked back to you. "That is to say, though they're sapient beings they act like animals, driven mainly by their desire to eat, breed, and occasionally battle. Depriving a Slaad a chance to do either of the three will make them unruly. In any case, I can buy this for twenty-five hundred (2500 GP)."

Looking over the silver brick, Ferric seemed rather interested. "My oh my Sylvia, just where do you and your friends got to find treasures like these? This is no ordinary silver brick. This is a solid mithril ingot! Why, one of these is worth at least a five hundred gold on it's own. But that's not the best part." Ferric put the ingot under his lens as he examines it closely, testing it with a few drops of some mysterious chemical he had underneath his counter. "Yes... This is very pure stuff. I wouldn't expect any less of course. Mithril, you see, has magic properties similar to silver when it comes to how it can affect certain creatures and monsters, but as a metal it's also very durable yet lightweight. Right up there with adamantine for legendary metals. Specifically, mithril is often used as an alloy in armor to make it much more lightweight, allowing even less physically strong people wear and move in large bulky armor. For example, find the right person and you could create a full suit of armor for your kobold friend or Pylia. Unfortunately, I'm not capable of that level of craftsmanship. My skills are decent enough to mend most gear and maybe work a forge for day-to-day wares, but something special like armor or weapons requires a true master." He slides the ingot back to you. "Still, I'll gladly buy it from you for five hundred gold (500 GP). Maybe with any luck I'll find a smith capable of working such a metal, and I'll have their wears in my shop!"

Finally, Ferric would take out the Mobile Home. Setting it on the counter between the two of you, it looked like a wooden version of the pumpkin carriage you might've seen in the animated Cinderella Movie. All it needed now was a small lantern and horses. "Ah yes, the Mobile Home. I'll admit I had this one here in Gransys for quite some time, never used. Though I really ought to have, it would've saved me so much trouble during my travels. But fate had other plans, eh? In any case, I've never actually set up the command word for this item, so once you spend some time attuning to it you can sent the command to whatever you'd like, allowing you access to it whenever you need it too. The only trouble I can foresee is that if you plan on taking this Mobile Home on the go, you will need horses to pull it. Considering that it's about the size of a standard carriage, you'll need at least two strong mules if you plan on going anywhere anytime soon. Alternatively, since I'm sure you've come into a lot of money, getting yourselves some proper horses will help you move more, faster, if time is of the essence."