In the Underworld film, there are two species who are rivals, the vampires and the werewolves or lycans. For centuries a war existed between the two species for political power and over who is more powerful than the other.
In the vampire clan, they don’t choose or elect their leader. The most powerful and eldest vampires are the ones who rule. This is in a cyclical manner wherein one of the leaders reigns while the other vampire elders sleep or rest. After a few centuries, the leader who reigns will be replaced by another vampire elder and the former vampire leader in turn will be the one resting. However, the vampire leader can appoint another vampire to lead if the leader deems that vampire suitable for his/her place before resting, the son or daughter of the vampire leader can also take over his/her place in the same way.
On the other hand the werewolves or the lycans do not have a specific method in choosing their leaders. Only Lucian has been their leader for centuries, who is the strongest of them. Also Lucian was once a slave of the vampires (all of lycans are before the war) and serves as Victor’s main fighter during the day making him the most experienced and has the most knowledge about vampires among the lycans.
In the film there are two vampire elders resting, Marcus and Victor, the two of the most powerful and eldest of the vampires. Another elder is Amelia but she is a leader of another clan. However, Kraven became the present leader because Victor appointed him. Victor only appointed him for Victor and all other vampires believed that Kraven killed Lucian (the lycan leader) which is a lie. For in reality Lucian is alive and in fact Kraven has an agreement with him, that Lucian will not expose himself and make everyone believe he is dead and Kraven killed him if Kraven never interrupts Lucian. Selene, a death dealer (vampire warriors that are specifically trained to fight lycans) and the adopted...