When the Fire Skylanders arrived at the mine, they noticed a familiar figure. "Yo, Blobs." Eruptor said. "What trouble have you gotten into this time?" "Well, I was supervising the Molekin while they were digging," Blobbers said. "We then found an ancient relic; The Crucible of the Ages! But however, something triggered a cave-in! Now the miners are trapped within the mine!" Quickly, the Fire Skylanders went to the rescue. While they freed the miners, they also faced Flame Imps, Rocker Walkers, Lava Kings, and some sort of mining machine, almost resembling an Arkeyan Ultron! While Ignitor borrowed a pick-axe to get through the rocks, Flameslinger needed some serious firepower, more specifically cannons and bombs, to blast the Tzo Crystals. Once all the miners were saved, a yelp of pain was heard! When the four investigated, Diggs was able to remove a rock that fell on him, but had his leg injured. Now he couldn't walk. However, there was a nearby mine cart that he could be pushed in, so he crawled inside with the Crucible. The Fire Skylanders pushed him towards the exit, with the task of saving the moles and retrieving the Crucible now complete.
"At last, the Crucible of the Ages!" Eon remarked. "Made to withstand the terrible forces of a thousand burning suns." Ignitor did the honors of placing the Crucible in the Core, just below the Skull Mask. Now, the Eternal Fire Source was next.
Meanwhile, in Kaos's Castle, Kaos had orders for his butler, Glumshanks. With his general out of commission, his butler was the only one loyal enough to do the task. "I have a job for you!" Kaos ordered. "Those Skylosers and that Portal-Poster have interfered with my plans to become emperor for the last time! But you, Glumshanks, can stop them." Kaos then proceeded to say the following a bit too fast. "All you have to do is make your way deep underground, sneak past the deadly lava guardians, withstand the burning heat of a volcano, and sabotage tracks of a mine train." He then took a deep breath. "Meanwhile, I'll go on ahead and simply go after the Eternal Fire Source myself. HAHAHAHA! See, there's more than one way to derail their plans!"
Back at the Ruins, Hugo informed the Fire Skylanders that the Eternal Source of Fire was located in the Lava Lakes. The tracks went even deeper than the Molekin Mines themselves. So, without further ado, the Fire Skylanders and Diggs went deeper into the mine.