It might be a coincidence, or perhaps inevitable, that the ancestors of the Yasenman Tribe formed a contract with the Sun Woman.
As long as the seed of the Sun Woman, the 'Original Seed', is transplanted into the body, the Yasenman People can gain the powers of plant and flame.
As a price, while obtaining this power, the Sun Woman would extract all the Life Energy from the Blood Vine Warriors.
The 'Sun Grace Fruit' that Su Xiao previously consumed is the fruit of the Sun Woman, and its core is the Original Seed.
Normally, the Sun Woman would absorb the 'Sun Grace Fruit' herself, leaving the seeds to appear in this cave for the Yasenman People.
The reason Su Xiao was able to acquire the 'Sun Grace Fruit' was that the Sun Woman was somewhat afraid of the Bahamut Winged Dragon and didn't dare reclaim the fruit, as Bahamut's Crystal Flame is not something that can be easily endured.
All the clues connected, Su Xiao already understood the Red Soil Area.
