The Vault Of Wonders

Meet Salazar Goldstein and his wife Zinny,if you need any magical items of extreme power then you must stop by the vault of wonders.
Owned by Mr Gold,the vault of wonders is filled with exotic magical items such as Manticore Gloves,Lycan Boots,Potion of Siren Voice or a Crown of Vampirism.
Besides those and many more items,Mr Gold got a most amazing deal to obtain a very rare and peculiar item,a dragon egg,but in spite of all secrecy a certain someone found out about the trade.
The vault of wonders lies burried deep underground with no regular entry,no door or tunnel leading to it,instead Mr Gold's wife conjures a portal in and out of the vault,magical traps protect the goods and theres even a mimic posing as a gold chest.
Few days after the dragon egg trade,Mr Gold's assistent Butch went into the vault for an inventory,only to notice that the dragon egg had vanished and a hole underground was dug.
Butch looked into the hole but he could not fit into it and only managed to see that the tunnel collapsed.
They knew that a kobold must be the thief because nothing else was missing except the egg and nobody could dig a tunnel as deep as the vault.
A big contract was now on the head of the kobold thief with a golden reward for anyone who could track him in his hideout and return the egg with the kobold dead or alive.
Are you ready to sign the contract?