Adding challenge log for older Deep Dungeons

[nguyentri11]

While the challenge log is cool, I think the biggest PT idea they could add to get more people into the older deep dungeons are extra checkpoints and letting people use matched parties to go to deeper floors.
(And maybe reducing every monsters health in Orthos, so that dungeon doesn't feel like wading through a poisonous swamp from the very start)

I'd also like checkpoints in older DDs. PT proves it makes DDs more accessible while not taking away the challenge from those who start from floor 1 if they wipe.