I'm sat at the sky border, failing that I had a massive base on the ice bergs on the island, 1000 turrets and about 800 plants, was impossible to raid due to DC lol
Wall of death in the big water cave on lagnarok. Covers the whole entrance and holds around 250 turret position. Our first line of defence with kill towers spread out all the way to the back. Till this day no one has come close to raiding this.