But anyway, cool that his skill lets him go to any dungeon now, wonder if next level or maybe at 25 he'll be able to bring others with him?
Well, right now, we only know of one person who potentially could follow him in grinding dungeons and that's his sister by copying his skill. Though if he wants to do that, he needs to carry her to level her up and help her grind. If he starts being able to teleport others, that'll make her skill a bit less relevant. Well, if he can only teleport a limited number of other people, I guess that having another person who can teleport herself is still convenient.
He might be able to bypass the limitation of being unable to teleport others with another skill. Maybe if the item box levels up enough, he might be able to create a space for a person to go in? We'll see.
So, is he able to grind and complete dungeons in less than a week now? I guess that then the fact the limitation on dungeons he's already been in being lifted is indeed significant since he could complete several new dungeons in less than a week.
Large changes to the skill only seem to happen in increments of 10 levels. It's actually quite weird he got this update at 21 since level 20 gave him time zero and level 10 gave him the change from a dungeon he is in, to a dungeon he has been in.
But man, outside of this ability to reenter dungeons to grind and skip levels, the skill isn't all that great for combat since it's considerably slower to activate than just running the distance physically (and that's just for normal humans, when you consider that he's enhanced thanks to his skills and level, he must be able to move considerably faster). The sub-skill really changed things and now it's pretty insane for combat.