Doing a daily dungeon is one of the best way to acquire upgrade and enhancement materials. It is recommended to use your red diamonds to reset once during Tuesday, Thursday, Saturday, and Sunday when you can finish Hard Mode consistently.
Tower of Insolence
Elite Dungeons are a type of dungeon in Lineage 2 Revolution.
Herb Dungeons are a type of dungeon in Lineage 2 Revolution.
Summoning Stone Dungeons