I don't know why I'm obsessed over this map, because even after dozens of runs, it hasn't really produced much drops, but I find it fun and the pets and accessories are good.
Nightmare is a little weird, you can drop the electric auras for some DU if you want, but be aware, there is a lul right before the hero rush at the end of waves and Tower Boost tends to drop off right before, so work around it, usually I refreshed TB at 800-ish kills.
Best time so far, 26 mins.
Party: 1 TB monk, 3 summoners with huntress/monk pets (2 at hint2, 1 at hint3)
Hint 1: have the oil trap just a little to the East more than the other traps, cause it has a little push back on the mages (not a big deal).