Trinity in terms of within the magical realm is nothing compared to that of the one in Christianity. It is a unity of three different people to keep the balance. There can never be more than one set of trinity who serve a particular god or goddess. In terms of Ishtar and Enki, the trinity that was to serve as priestesses for them had been chosen long ago. The three sisters had been marked even before they were born by the two gods to be under their services. Not only would they oversee keeping the balance in the realm of the gods and the mortal world, but they would also be the ones to keep the prayers ascending to the gods. Light, Darkness, and the High Priestess would work as one to handle all the matters to their status. 

Of course there would be a set of rules such as marriage or physical contact that is within a sexual manner is above all avoided. Loyalty to the god or goddess that they are serving. Loyalty to each other. To be clearer of everything that the trinity are responsible for and their priestess status hood.

1. Roles and Responsibilities:

Temple Service:

Priestesses were responsible for maintaining temples, performing rituals, and overseeing sacrifices. 

Cultic Officials:

They held positions of authority within specific cults, often serving as intermediaries between the gods and the people. 

Specific Duties:

Depending on the deity they served, priestesses might have specific duties, such as opening temples, burning incense, or organizing religious collections. 

2. Rules and Expectations:

Chastity:

While not always required, some priestesses, particularly those serving certain deities, were expected to be virgins, or at least to abstain from sexual activity during their tenure. 

Modesty and Conduct:

Priestesses were expected to adhere to strict standards of decorum and modesty, reflecting the values of the society. 

Dress Code:

Sacred laws often restricted the types of clothing and adornments priests and priestesses could wear, aiming to limit luxury and excessive display. 

Oath:

To follow, worship, and serve Enki and Ishtar even if that means giving up one’s life. To live within the temple and giving up worldly possession if one possesses any as well as any titles. 

Social Standing:

Priestesses enjoyed a degree of social standing and privilege, including reserved seats at public events and freedom from certain restrictions. 

Political Influence:

Some priestesses held significant political influence, and their opinions were sought on matters of state. 

Public Roles:

In addition to their religious roles, priestesses could participate in public life and festivals. 

Sacred Laws:

Cult regulations, both written and orally transmitted, provided norms for those who fulfilled cultic duties

Magical abilities to protect and fulfill their duties:

Each priestess since the time of conception was given their own set of abilities as well as those that would tie together or complement each other. Furthermore, they have abilities that have been inherited.