Hebrilax

Hebrilax was the dragon own by Gaen Zyran, the only survivor heir to House Zyran. His family, himself and his dragon's survival was pure chance, as they were in Lys before the fall of Valyria. Gaen became thus the only continuation of the Zyran House, which was one of the few Valyrian houses to survive the doom. Hebrilax was the biggest dragon to survive among the Zyran household but was crippled for over 27 years of his later life, making it imposible for him or his rider to fly and thus he became more of a burden than a weapon. In fact, it cost the family a large amount of their previous wealth. Gaen was the third of his family to have mounted Hebrilax.

Origins
Hebrilax was born within the Zyran House from a clutch of eggs somewhere around 200 years before the doom of Valyria and about 310 years before Aegon's conquest of Westeros. He was about 223 years when he passed. It had hatched in the craddle of Gaen's granfather Areon Zyran and was later passed to his father, before being claimed by him soon after his father had passed away. This dragon was one of the main ones of the Zyran family passing through generations.

Gaemon was 22 when he finally claimed the dragon and did protect it until it's last breath, even when his sons and daughters discussed the possibility of eutanasing him due to his injuries. Gaen set guards on the garden pit where he was held day and night, promising that if the dragon died, they would pay with their lives.

Description
He is described as being black-brown, of a fierced nature specially in his younger days and very difficult to approach to except for those bonded to him among the Zyran family. During his later days, this male dragon grew fatter and more melancolic. It is also said that Gaen's grandaughter, Saphya, was the only woman apart from Gaen to be allowed and even permited to approach the dragon. It seemed as after Gaen's death, if the dragon was to survive him, he will be bonded to her next. However, the Dragon died of old age, when Gaen was reading a book story to her gran-daughter as they layed with Hebrilax. It is said that they moarned him for over 3 years. Safya is said to have been speacially hit by the death of the dragon and carried one of the dragon eggs with her at all times.