First you need a minimum number of one type of Globe. To upgrade it from 2 to 3, you need Globe Chairs
Then you need to collect those small blue things that drop when you hunt monsters near your level. Once you use 3 tree globes and have 200 of the blue things, the Globe automatically upgrades.
For 3 to 4, you need Figurines. In short, when you get one of the upgrade materials, hang onto it.
I keep saying, Nexon was just sick of players calling them greedy crooks with a "free to play, pay to win" game (even though the Cash Shop is their only means of actual profit and the reason you can play for free in the first place), and released Reboot to teach them a lesson.
