In the house of dragon series Vhagar is the most powerful and last longed dragon since the ages and during the time period of dance of dragon (fire and blood) she fought 100 battles and she is the largest dragon in size of all the dragons that lived at that time.
Simply to say it’s a beast and no dragon is a match for Vhagar and it has a lot of experience in battle and Vhagar knows how to take down opponents in the battlefield.
How Old is Vhagar?
Vhagar was 181 years old during the battle of dance of dragons (fire and blood) when Aemond was her rider and she fought more than 100 battles and was well experienced in battle and knew how to survive and take down opponent very well.
How was Vhagar Killed?
In the brutal battle with Daemon Dragon (Caraxes) in the shores of God’s eyes in the battle both dragons Vhagar and Caraxes and riders Daemon and Aemond were drowned and only caraxes made it to shores and died after sometime.
How Many Dragons did Vhagar Kill?
As of House of Dragon season 2 episode 4, Vhagar killed 2 dragons. In the battle of Rooks rest Vhagar killed Rhaenys Targaryen and Meleys and in the process it also burned the sunfire dragon which is Aegon king dragon.
Vhagar also kills Lucerys Velaryon and Arrax in the season finale of house of dragons.
Who Killed Vhagar Dragon?
Well there is no match for Vhagar dragon of that size but Daemon Dragon Caraxes put up a big fight with Vhagar and it also takes down Vhagar by biting Vhagar neck to tear it off when these two dragons Vhagar and caraxes comes face to face in battle and Vhagar also crawls caraxes stomach and it opens it and also tears down caraxes wins but caraxes doesnt gives up.
In the brutal battle with Vhagar rider Aamond and Daemon rider Caraxes, suddenly Daemon jumps to Aemond and strikes with his sword Dark Sister into one of the Aemond eye and both dragons fall from the top into god’s eye river and fall from mid air.
It is said in books that 4 of Vhagar did not make it to shore nor any of them but Caraxes makes it to shore and dies after sometime.
Later the body of Aemond was found with a dark sister (Daemon;s Sword) in one eye of Aemond and it was attached to the king’s throne.
 in the shores of God's eyes in the battle both dragons Vhagar and Caraxes and riders Daemon and Aemond were drowned and only caraxes made it to shores and died after sometime.){kind=link}