Mercury rules 8th and 11th house is in 12th house in Libra

When Mercury is placed in the 12th house in the sign of Libra in a person's birth chart, it can indicate a strong desire for mental harmony and balance. Such a placement can also make the native intelligent, articulate, and diplomatic.

The 12th house is also associated with spiritual pursuits and losses, so this placement may indicate a tendency for the native to explore the realms of the mind and engage in philosophical or religious pursuits. The individual may feel drawn towards psychic, mystical, or spiritual practices.

The Libra sign can make the individual diplomatic and sociable with a keen sense of fairness and justice. They are able to weigh the pros and cons of various situations and make balanced decisions. They may also have an interest in aesthetics, art, and culture.

Overall, this placement indicates a need to balance the mental and spiritual dimensions of life. The individual may need to work on overcoming the tendency towards escapism and instead channel their intellectual abilities towards practical and productive pursuits.