King Yemma looks down in his big book and searches for your name. His finger goes down the long list and suddenly he says he found you. His eyes lighten up and he watches you strangely.

KY: "How strange, there aren't many people who get this honor these days anymore. In my days, when heroes were a common thing, but now..."

You interrupt him, telling that you want to know what he finds to be so strange and he tells you.

KY: "You have been chosen to receive training with a Kai."

Now he escorts you to two doors, one with an arrow down, one with an arrow straight ahead. He scans your aura and you're off (See Rules of Afterlife), evil people go down and train with Dabura good people go to one of th Four Kais. But before you get there, there's is a mandatory time for traveling the Snakeway.
While training on King Kai's planetoid is fixed at x10. If you use a graviton, the gravity gains does not stack.
In HFIL, there is no increased gravity, yet one who has learned the Flame Aura from Dabura can increase its level there.

He then tells you that there's a Special Shop on the other dimension, full of rare items. And from there, to cross the snakeway and reahc the kai's planetoid, a whole day of inactivity is needed. In the case of villains in Hell, they do not walk the snakeway, but they need a whole day of searching for Dabura as well.

Some Few Rules About the Other Dimension
1) Anyone of an evil alignment or chaotic/evil neutral must go to the HFIL.
2) Anyone of a good alignment or lawful/good neutral must go to the Heaven.
3) Pure neutrals must choose upon death.
4) You may train with only 1 of the 4 Kais or Dabura.
5) Once your afterlife has been chosen it is impossible by teleportation or otherwise to go to the other afterlife, this includes the Kai's, with the exception
     of in certain saga events.