Tree of Savior (KR) Eases Late Game Leveling with Guild Raids and New Dailies
Completing guild raids will have a chance to get rare mounts, pets, and seeds. To enter guild raids, a guild must have at least level 4 guild tower. As for the challenge tower, the first 20 floors will be available in this month's update. Players will encounter a boss every 5 floors. It's worth noting that each floor is required to complete in 4 minutes.
TOS is a grinding MMORPG and it's a good thing that the game tries to balance the level of grinding at late game.
Source: TOS CN fansite