The show really metaphorically redefined the term "mining" in this episode. Not going into it much but it shifted from material stuff to something more important for the narrative. Gradually, they are giving us more action and suspense considering the discovery about the true nature of an important plot device in the series. One moment that stood out though was the ingenious use of said object to defeat a more powerful enemy. Other than that, the real villains are making their presence felt and it's setting up a climactic clash at the end of it all. Hope it's worth the wait, they're really hyping it up.