Ancient Jews would hire professional wailers to mourn the deaths of their loved ones. In Runeterra you get Karthus the deathsinger. They are not equal. Karthus is way cooler, but also way way worse because he doesn't always wait for you to be dead.......

Credits: 

Karthus Story and Biography:

https://universe.leagueoflegends.com/en_US/story/karthus-color-story/

https://universe.leagueoflegends.com/en_US/story/champion/karthus/

Karthus Voice Lines:

https://www.101soundboards.com/boards/28348-karthus-league-of-legends

Elise Theme Music:

https://www.youtube.com/watch?v=skD_I-SHk30&t=13s