Like I said pylons were a hard fail for me. Level 20 in the skill. It did have armor. The problem was more one of monster volume and the mechanics the map throws at you. The standard pylon “feeder” layout, with a ix of T4 and T5 gems, could not keep the Pylons shooting enough and two pylons wasn’t enough to keep up with all the monsters.
I did beat it. The first thing I did, on examining my talismans, was realize I had made a previous error and that I could in fact make a row of 5 consecutive shapes. I had two sets of shapes that I could possibly make a 5-square line with. One was missing a right-edge piece. The other, I thought, was missing an inner piece (with the dumb luck of having one edge with a dupe, and a corner piece that did me no good). But it turned out I did have a third inner piece I just missed it.
Redoing the grid did require some work. In fact the storage limits make it really annoying. I wish there was a “temporary” area that was more than 5 squares even if it was only temporary. But my starting mana bonus went from, uh, something like 124% to 174%. This was not a huge help, but it was a help. Using 4 towers, 1 Amp as the main, I build like double the number of extra towers for [redacted] than I had been. And I focused upgrading on my “rover” gem a litttle bit more than the main defenses.
It was still very close. It didn’t help that I missed a purple apparition thingy on two occasions and it ran off with one of the core defensive gems (I was able to get it before it left the map but that disrupted things considerably). I was sweating a bit over the last few waves. I probably should have consolidated the 4 main minion killing gems a bit sooner.