Lucina Weismann escaped alongside her son Emil after the death of the king. It has been recorded, that she barely escaped and suffered extreme injuries. It can assumed that she did not meet her destination and succumbed to her wounds.
Emil Weismann had lived after the attack. Where he had fled to is unknown. However, upon his return he had killed his sister Serena and kidnapped his niece Diana. Along with the kidnapping he had destroyed all evidence and research in regards to the elixirs that King Ulric had collected. To him everything was lost but one remaining elixir.
Emil had once again fled, and fled to a content south of Rhea. It was yet to be fully established but it had people living on it. Here he met an individual who he trusted and felt compelled remain at their side. He helped create the Eldian kingdom alongside the individual.
It was rumored to believe that Emil and the Queen Ymir had a perfected elixir that the Queen had consumed. It was with the help of an older women, who was a self-proclaimed witch who helped perfect it.
On a mission of peace, Emil and the Queen came to Rhea. However, their actions were deemed as useless as many had treated them poorly. As they were brought before King LeBlanc, they were condemned and forbidden to return to Rhea.
Once back, Emil had begun his own research on a new elixir. He believed that he needed to have an army to defend the growing empire that Ymir was trying to create. However, his efforts were proven to be worthless as his elixir created nothing more than mindless beings. Much like how King LeBlanc's army had feel to the curse, those who consumed Emil's elixir were not humans. They were distorted humanoid beings who wanted nothing more than to consume the flesh of humans. Emil conducted further research and learned the properties of the behavior of the mindless beings. Those of which can be referred to today as titans.
Not long afterwards, traces of Emil had disappeared. It was believed that he had passed away due to unknown caused. At this time the Eldian Empire began to grow under the rule of Ymir.
However, Ymir lived on for another thirteen years. This was documented as the witches curse or the Curse of Ymir. Nine individuals inherited the powers of Ymir through an unknown connection that the people shared. It was believed that this connection was created by Emil, working much similar to the Weismann power that is inherited. Rumors occurred claiming that Emil had sacrificed himself to enable the people to obtain a part of him. Others claim that Emil had disappeared leaving Eldia to thrive on its own. What remains the truth is that Ymir had harnessed the full capabilities of the Weismann bloodline and waken the dormant titan attributes among nine individuals through her sheer power of will.
Over the years Eldia grew in power. With the power of the nine titans, they conquered the entire land that they resided on.