Oh, I meant gunpowder arc.
Ah yeah, that'll do it... Most of the arcs are pretty dangerous when you're using them straight up!
Anyways, lost a LOT of progress today... Was playing on the same save that'd crashed earlier, and while that save is a little odd (some terrain/items are like they were before I went into the sky, some thing are like they were after) and I seem to have lost a couple wands to save glitchiness, it's still a good seed and I've got a couple crazy wands.
So I kept going, exploring, trying stuff out... Ended up with even crazier wands (including a 25-slot wand that I filled out with about 14 damage+ shocking burning crit-on-burning homing mists), got explosion immunity on top of lightning immunity, learned that dormant crystals are capable of some serious homing and also are immune to acid (which means that if you have one with an acid trail, you can just place it and it will sit there forever constantly pumping out acid and melting the terrain underneath it), used my new immunity to put together a crazy lightning shotgun wand and learned that if you put a trail on lightning, it will apply quickly enough on a direct hit to count for critical calculations (I.E., water trail + crit on wet enemies let the lightning crit everything on the first blast, although that might have something to do with there being multiple bolts). Also I was using lightning to douse myself, which I found kinda funny.
Melted my way through the vault, was fiddling around in there for a while when suddenly... I fucked up bad. Hit the hotkey for what was usually my digging wand, but I'd swapped it out for the acid crystal. Got a faceful of green death.
And, uh... Turns out you can savescum! So I'm only about, ooh, 6 hours back... Instead of nearly 20.
EDIT: Oh, right, and there's a new update out now with new spells/enemies/stuff. Also apparently a new secret ending, I guess in case the moon wasn't enough? Jibbers.