Kingdom Rush Frontiers (Steam) Impossible Hero Challenge - Darklight Depths Heroic

There's not a whole lot to say about this one - or rather, I don't want to say much about it in order to contain my seething rage.  It's largely a redux of campaign mode, with the same frustration that you need to keep your blockers at least somewhat alive.  However, the constant stream of Deathcoils makes that a tall order.  The solution is to go all-in with DWAARPs.  Once you get a few rolling with Furnace Blast it takes care of them and everything for the rest of the level, but until then you're stuck just watching your hero, dwarves, and reinforcements die constantly.

This map is particularly evil in that even if you try to send your hero and reinforcements after a Deathcoil, most likely another one is about to enter the map and immediately start sniping them.  This constant drip of Deathcoils continually covering one another is particularly rage-inducing.

We have to give all heroes 'A's again, again not because the map is easy, but because there's nothing much for them to do.  I forgot to explicitly mention it in the campaign mode entry, but part of the strategy here is to deliberately place your hero below the dwarves.  The dwarves will then be closer to the Deathcoils, making them target the dwarves first instead of your hero.  This allows your hero to actually do a bit of their job in blocking and DPS mobs that make it to the chokepoint, but as with campaign mode, there's not enough of it that it really makes a difference which hero you use.

Kingdom Rush Frontiers Impossible Hero Challenge - Darklight Depths Heroic