On farming the seventhsTIPS
The new subchapter continues on the trend set by all but the first subchapters of Chapter 2. The seventh dungeon of those subchapters drops a four-star armor (always the same across the five subchapters in question). Four-star equip is better fuel for Soul Carta enhancement. What makes the new Seventh more attractive than those before it is that it drops red evolution crystals, helping an f2p player to more easily evolve the aurora heart material childs. It also has an exp bonus. So, if one is not dissuaded by stamina cost or by imbalance in crafting tools inventory (all sevenths so far drop only armor crafting tools), the new "Luin's Intensive Training IV" is the place to go for daily 10.
They never admitted to those drop tables being a bug in a bug report post of mine from some six months ago, so everyone is entitled to their own opinions.