Does anyone have experience with Draceana Draco? Specifically, when you think it's completely dead because it used to be 4 feet tall and then it loses every branch, the stem turns ash grey, and black, the roots are mush from rot and completely gone in their entirety, and then you leave it in the pot all summer outside in the pouring rain and 110 degrees for two weeks and it comes back to life after 3 months?

not specifically, but there can be scraps of life in some very dead looking things. And sometimes ignoring the 'dead' plant works best.

@sallyg Thank you for the reply! I'm honestly astonished. I mean, I did read once someplace that if there's even one cell still alive that it's possible for it to regenerate, but this thing was good and dead. Everything that I was told not to do I basically did after I thought this thing was dead. I just let it be and now it's growing much faster. I know this particular species is succulent-like, so I'm not certain if that could have played a role somehow? I also don't know if there are new healthy roots actually growing, occasionally secondary air roots do grow but I don't see them on this plant at all. I didn't want to actually look and risk disturbing anything. I had placed the pot with the soil in isolation as to not risk disease spreading to my other plants. I treated the soil with several chemicals, systemics and non-systemics, I washed and cut all the roots, soaked it in hydrogen peroxide and just for fun to see if anything could happen I applied a root growth stimulator, chelated liquid iron, and Liquid Silicon. I mean, I figured it couldn't hurt and I was just going to throw it away but I never got around to it. I'm glad now that I didn't but I'm still concerned that the original bacteria or fungus might still be present in the stem and soil. Who knows maybe it'll be more resistant somehow in the future, it is outside of its zone, and I don't have much luck with these despite constantly being told they are the hardest plants to kill, I guess I'll wait and see.

Fun experience !
I once saw a tree stump conpletely dry and inactive thru 2 summers, then sprout.

The "root rot" disease has more to do with how you treat it than any 'infectious' organism. The fungi are always there, but a healthy plant won't get 'infected'. When the roots die from improper care the fungi get in and decompose the dead tissue, which causes more dead tissue, which causes MORE dead tissue and so on. Once you clean off the dead tissue, removing the fungi, the plant can get on with regrowing new roots.