Chou, Chen, Wei, and Xu are called the four tombs in numerology. When Chen meets the heavenly stem Jiamu, it is the treasury, because Jiamu overcomes Chen and earth. Among the ten gods of numerology, the one I conquer is wealth, so it is a treasury.
As for the dragon guarding the treasury, it is because the earthly branch "chen" represents the year of the zodiac dragon, so it is derived.
In the horoscope pattern, if the treasury is strong and has auspicious effects, the owner of the life will have wealth (money), and most of them will be wealthy people.