This mode is perfect idle-grinding. Upon selection, you can choose which area to farm mob kills, preferably in an area that’s within your level range. While the amount of EXP you can get per mob kill is relatively small, you can just set the combat in Auto mode and just leave the game running without requiring your attention. You can team up with other adventurers to increase efficiency or use a “Wild Trial 2x EXP” consumable, which you can buy for 5 diamonds each. Furthermore, if you have the “Time Adventurer” Title equipped, you can get an additional 100% EXP boost per wild enemy kill.