Some feedback on the mythic world:
The amount of ores is really high, I got 107 diamonds from 3 diamond veins using a fortune 3 pick. I found those veins a few minutes apart running through caves. If I was branch mining it would have probably been a bit longer but it would have also been safer.
The mobs I feel are in a good place right now, they're a threat but not a constant annoying presence like before. A few times I got pretty low on health while having a full suit of protection 4 diamond. Of course the totem of undying meant that I wasn't at risk of dying anyways.
/home and /back seem to no longer work, which is fine. /spawn does, which I hope is intended otherwise it'd be a terrible waste of time to have to return to spawn to warp out. Maybe add a few seconds delay or a not-moving requirement to prevent it from being a cheap way out of a fight though.
The Evokers seem to spawn in the darkness like the other mobs, which makes totems much easier to get (though vexes are extremely annoying to fight in caves because noclipping). Not sure if this is intentional.