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As the dividing line between intermediate and advanced civilizations in the Starry Sea, the gap between Sixth Rank and Seventh Rank lifeforms is unimaginably vast.
This can be seen, in part, through the lifespans of beings at different levels within the Starry Sea.
Take Torch Human Civilization for instance: Zero Rank average humans live only 140 years, First Ranks have 200 years, Second Ranks 300 years, and Third Ranks 600 years. So why does the lifespan leap to 2000 years at Fourth Rank? The reason lies just there.
Similarly, after the Fourth Rank, the lifespan of Fifth-Rank Torch Ship Captains is limited to 4000 years, and for Sixth Ranks, it's 10,000 years—no excessively dramatic increase. Only after breaking through to the Seventh Rank does the lifespan experience a new surge.