While there is no concrete date announced for the release of George R.R. Martin's "The Winds of Winter," speculations say that it may finally answer the question as to what hinders an alliance between the Targaryens and the Starks.

According to a report by University Herald, the two houses are forbidden from uniting because it would concentrate the powers of the two families into a single entity.

The Targaryens are known for controlling dragons, while the Starks of Winterfell have the ability to warg into animals and other human beings. Having a child that has the ability to both warg and possibly control a dragon could translate to an unequal distribution of power.

The theory came just as it was revealed that the seventh season of HBO series "Game of Thrones" is poised to introduce an alliance between the King of the North Jon Snow (Kit Harington) and the Mother of Dragons Daenerys Targaryen (Emilia Clarke).

It is unsure how Jon's parentage will figure into the plot after it was revealed that he was indeed the son of Lyanna Stark and Rhaegar Targaryen, Daenerys' brother. Earlier fan theories also speculated that he was the incarnation of Azor Ahai, or The Prince that was Promised.

Meanwhile, the Night King in the books may well be different from the Night King in the series, reported Digital Times. While the Night King in the show is described by showrunners as the personification of darkness, the Night King in the books was actually a Stark who fell in love with a woman of ice and cold.

Until Martin comes out with the sixth and seventh books in the series, fans won't know for sure if the entity may even be included in the final battle.

Rumors are rife that both "The Winds of Winter" and "A Dream of Spring" will come out in 2017 before the release of the eighth and final season of HBO's "Game of Thrones" to provide more context to the show.