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.
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.