Neptune in 8th House synastry relationships are based on mutual interests in religion, occultism, and mysticism, the issues of reincarnation, the immortality of the soul, spiritual and intuitive communication, as well as astrology.
If Neptune is positively aspected, the partners actively participate in financial, humanitarian, religious, educational, medical, and charitable projects. The deep, often subconscious knowledge of the “Neptunian” personality in spiritual matters, as well as its mystical worldview, helps the personality of the Eighth House to overcome insecurity and false fears and grow spiritually. In turn, the latter provides reliable material and everyday support of the “Neptunian” personality in all constructive endeavors of their joint life. A marriage between Neptune in Eighth House synastry partners will further strengthen the social and material well-being of them both.
If Neptune is negatively aspected, misunderstanding, disharmony, evasion, and dishonesty in the relationships lead to a violation of constructive communication and significant material losses.
from F. Sakoyan, L. Ecker
Neptune in 8th House Synastry Explained
Neptune in 8th House synastry partners ensure that you two have strong meditations, but their nature can change dramatically depending on the circumstances of our external and internal life, as well as the phase of development of relationships. Here both parties are vulnerable to each other, but it is better to demand delicacy from yourself than from the partner, otherwise, the meditations can become sharply negative, sometimes turning into displays of mutual hatred.
In a positive relationship scenario, Neptune in Eighth House synastry can give you a great sense of community, especially in critical situations, when the partner feels genuinely sorry for you, sympathize, show mercy and compassion. However, in the normal course of your life, any lie or a bad mutual understanding can cause you a violent protest and indignation, which does not correspond to the superficial “objective” view. Nevertheless, if you dig deeper, you’ll perceive complex programs of subconscious self-deception in your partner which only your heightened perception can expose and rectify.
To understand Neptune in 8th House synastry, it is crucial to bear in mind this sensitivity to the veracity of your partner: in a critical situation, you can reject their compassion simply because you don’t think it is truly sincere, or because you suspect your partner is playing some kind of game. However, you can easily turn out to be the one who’s playing unfairly (especially if your Eighth House and your own Neptune are poorly developed), so either the partner will be rightfully offended, or a false accord will arise between you, which will affect you harder than your Neptune in 8th House synastry partner.
from A. Podvodny