Kingdom Rush Origins: Dwaraman Gates Heroic Instacalled on Impossible - Eridan Barracks Only no Sell

Easy until wave 6, where is immediately scales up 10 times in difficulty. Bladesingers actually worked really well here because they could stall the enemies indefinitely and slowly take their hp down with true damage from perfect parry. For wave 6, needed to stall the bottom lane with low level barracks until the enemies got bunched up and then just use lightning on them. Also use arrows on the top lane. Then send bladesingers to top lane and get blade dance so they can deal with the rest of the spiders up there. The other bladesinger can hold off the middle lane and once you get lightning again, just use it on the dark spitters.