The reason I said Dynamite isn’t good is that it’s very hard to hit dens, so it ends up destroying the mountain before breaking them. I think the key to getting stronger is to destroy as many dens as possible before the mountain collapses, in order to collect more mithril.
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You're right. And the fact it damages both the den and mountain ends up being a downside. I think I'll make their default radius slightly bigger so it's easier to hit dens early. Another idea I have for a future upgrade is that dens killed by explosions cause the loot to fly with greater force, hopefully directly into your stash. We'll see how it ends up in the end.