How To Obtain
The first step to obtaining this shovel is by speaking to the Brutus NPC. He will ask you to find x3 exotic Amulets: the Amulet of Cats, Amulet of Hobos, and Amulet of Ruffles. These will unlock the gate. You can find these while digging, but keep in mind the gate will only unlock after you complete the Relica Collection.
Once the collection is complete and you have all of the Amulets, unlock the gate to be teleported to the Gorgon Maze. Make sure you check out our walkthrough linked above, as it goes into more detail on the maze!
After you finish the maze, you will find yourself in the Colosseum. Before you can move on, you need to dig here to obtain the Roman Key to unlock the next room. Once unlocked, there will be a boss. He slams into you, so you have to time your movements to avoid being hit.
You’re nearly there! After you avoid the boss, you will enter an area called the Thunder Cave. Jump across the rocks to reach the Thunder God Shovel. Make sure you don’t touch the water whilst jumping.