Actually if 5e is the last edition it will be because the leeches at Mattel do not care about the community and will transition, as they already are, to an aggressively litigious "business model"
I realize this is a bit of thread necro but I believe it is worth pointing out:
there is one line in guardian soul that is being overlooked under "Ancient Fortitude":
"This increase lasts until you leave the form; your hit point maximum then returns to normal, but your current hit points...