The Sisters' Shared Goal and Twisted Methods:

Foreknowledge and Preparation: Their shared knowledge of the never-setting sun gives them a unique perspective and a sense of urgency. Unlike most of the population, they are actively preparing for a world-altering event, albeit in a horrifying way. This makes them proactive antagonists with a clear, albeit selfish, goal.
Necromantic Leanings: Their shared affinity for necromancy unites them and informs their methods. They see death and undeath not as a tragedy but as a resource to be exploited for their survival and dominance.
Undersea World of Slave Creatures: This is a chilling vision. An entire civilization built on the suffering and enslavement of others creates a terrifying potential future if they succeed. It also provides a specific location and type of threat for your players to confront.

Individual Personalities and Conflicts:

Dr. Akiva: Her vanity and desire for attention clash with the demands of her work and her resentment of her sisters. This internal conflict could be a potential weakness. Perhaps she could be manipulated through her vanity or her desire for recognition. The "suitor" aspect is intriguing – could someone try to exploit this? Her scientific approach to creating the slave creatures adds a layer of disturbing ingenuity to their operation. She's not just raising the dead; she's building them in a grotesque parody of life.
Uloo: Her direct consumption of others to enhance her necromantic powers makes her a particularly brutal and immediate threat. She represents the raw, destructive potential of their magic. Her reliance on this dark practice could also be a vulnerability – perhaps she becomes weaker if denied a source of life force. Her dynamic with her sisters, particularly Margosa's control, could be a point of friction. Does she chafe under Margosa's leadership?
Margosa: As the leader and the one who has sacrificed the most, Margosa is likely ruthless and highly focused. Her control over the plan and her willingness to commit atrocities (consuming whole villages) demonstrate her unwavering commitment to their vision. Her strength and the perceived "desire" for the power she wields make her a formidable opponent. To defeat her, the party might need to understand what she sacrificed and exploit any lingering vulnerabilities or guilt.

Potential Conflicts and Storylines for the Party:

Discovering the Undersea World: How will the party stumble upon this hidden, nightmarish creation? Perhaps through rumors of disappearances near the coast, strange underwater sightings, or even a captured individual who escaped.
Stopping the Village Consumption: Margosa's methods pose an immediate threat to innocent populations. The party might be called upon to investigate these disappearances and confront her directly. This could lead to a morally challenging situation – how do they stop such a powerful necromancer?
Exploiting the Sisters' Internal Conflicts: The resentment between the sisters could be a key to defeating them. Could the party manipulate Akiva's vanity or Uloo's ambition to turn them against Margosa?
Understanding Their Foreknowledge: How did the Sisters of Opportunity learn about the never-setting sun? Do they have a connection to Dr. Dee, the Thane, or Countess Una? Understanding their source of information could provide insights into the nature of the impending event itself.
The Ethics of Their Creations: Dr. Akiva's scientific approach to necromancy raises disturbing ethical questions. Are these creatures truly slaves, or do they possess some form of sentience? How should the party deal with them if they are freed?
The Sisters' Motivation: While seemingly selfish, is there a deeper reason behind their desperate actions? Do they genuinely believe this is the only way to survive the coming catastrophe, or are they simply power-hungry?

Connecting to Existing Plotlines:

The Grave Order: Do the Sisters of Opportunity have any connection to the Grave Order's necromantic practices? Are they rivals or potential allies?
The Dark Ambassador: Could the Ambassador see the Sisters' undersea empire as a potential asset or a threat to her own plans?
The Praetor's Instability: The chaos caused by the never-setting sun and the actions of groups like the Sisters could further destabilize the Praetor's rule, playing into Artemis Quire's schemes.

Sisters of Opportunity