Although they choose their mate on the day of their coming of age, it does not mean the mate the celebrant choose cannot reject them if they want, although it rarely happens, that is why the father or mother of the celebrant sometime will have already prepared a long line of potential mate from both gender for their child before that day.
When their son choose another girl which was not part of the potential mate he mother has prepare, it becomes a shame on the city lord because he believe that anyone female that attend this party should have known that they can be choose as the first mate, so why will you reject if you are in the party.
The situation is made worse when they all realize that the girl in question is a half elf girl, she should have been grateful to even be notice by a true bred elf, although her cultivation tage is higher than his son which should have been the reason she was able to get into this party in the first place, but his believe that can be fixed and beside her cultivation stage been higher should not have been the reason to be rejected in a public setting like this one.
The choosing of mate did not mean they are to be together for the rest of their life. Elf lives even longer than human cultivator in higher realm than them so the mate may decide to leave the relationship after few years.
The city lord try to use his power to bully the half elf girl, which just happen to be Erika of that time, and she lash out without a second thought and the party that was supposed to be joyous became bloody within minutes.
She made a bet with the city lord that she will fight three of his best fighter in her stage of cultivation or a stage higher than her own, their sub stage does not matter, if anyone of them can defeat her, she will willingly become his son first mate, and if she wins the three battle the city lord is to give her his membership card at the store that produce lily dew wine in his city.
The city lord accept the bet without a second thought, and he send out two of his best fighter at a stage higher than Erika at that time, the city lord believe she should be confident enough to win since she propose the bet so he select fighter in stage higher, she defeat them after much struggle, and for the third fight the son himself volunteer to fight, since he believe Erica is to become his first mate so he should be the one to subdue her, beside she should be weak now after that struggle with the previous fights.
It only the people in the higher realm than even the city lord that realize that Erika struggle against her previous opponent was nothing but Erika feigning weakness, she could defeat those two with her two hand tie behind her back, and the people who realize Erika fakery[fakey] were Raelynn protectors, who were there in the audience with her, Raelynn giggled when she heard them said that, excited at the misfortune that is about to before the city lord.
The moment the city lord saw that his son's life was in danger he starts to pressure Erika with his power to help his son win, the people strong enough to notice what the city lord was doing are either friends of the city lord, those too afraid of the city lord to point out his act of shamelessness and the protectors of Raelynn.
The goddess of life been presence in the audience, who happen to hate people been bully, saw everything, and she attack the moment the son try to defeat Erika, the goddess not been pressured like Erika was and also far stronger than Erika, she killed the son in one blow.
What follow what nothing short of massacre in the city lord mansion, those strong enough to notice the shamelessness simply excuse themselves from the fight even some who called themselves the city lord's friends became quiet when their realize who the new girl protectors was.
Since the city lord is already blinded by his rage at having his son's killed in his present, he did not notice who is was fight or the girl that killed his son, since he dare attack, everyone knows he fate is already sealed. And for every other person that involved themselves in the battle all forfeit their lives either to the grim reaper who is the new girl or the beast who is the half elf girl.
Raelynn been the princess of an entire race of people who are known for their crazy power level, every single person who stand in her way was not even her match, whether they are a stage higher or two stages, they all lose their life to her sword, and Erika was even more of a beast, while Raelynn pride herself on been able to kill anyone in one to three strokes of her sword, Erika just want to tear them apart, limp from limp with her bare hands while she let the blood of her enemies soak her from head to toe.
Since one of the protector of Raelynn at that time is holding off the city lord, Raelynn and Erika practically graze the entire mansion to the ground. the city lord could do nothing but stare as his wives, children and his personal army are all killed, the only people left with him are the ones a stage below him which Raelynn's protector prevent from getting involved in the fight.
To put salt on the already open wound of the city lord, they still demand for Erika price of defeating her three opponent, the city lord has no way to reject her, it either he give her the price or his city be grazed to the ground.
Since that day, the two girls just bonded and became inseparably, and the cultivation world witness the birth of 'the life and the death twin'.