Goblin Engineering

As a goblin you have learned to create using anything at your disposal, when making items or casting spells you can substitute items of material value for items of 1 tenth the cost when building or casting, when you do so your creations have a chance to self destruct when using an item created in this way roll a d20 on a 1 the item is destroyed. When casting a spell roll on the wild magic table as well to determine the outcome of the malfunction of your spell casting.