During the events of "Imperfect Harmony", this dragon lured numerous dragons, including Stormfly, Meatlug, Hookfang and Barf and Belch to a cove, before trapping them with amber. He returned to the cove after a while and picked off a dragon to eat. When he returns, he spots the Riders hiding behind a rock. Toothless instantly jumps out and engages him, but Garff's father immediately encased him in amber. He quickly traps all the other Riders, all but Hiccup, who fled.
Soon, he tracked both Hiccup and Earsplitter down but was tackled by the latter. Hiccup shoots several bolas at him and successfully holds the Death Song off. The duo quickly flees the scene and Garff's father escapes soon.
Back at the cove, the dragon picked off another Gronckle and devoured it within seconds. He planned to eat Fishlegs, but Hiccup and Earsplitter swoop into the scene. Frustrated, the dragon chased after the duo, who quickly freed the other Riders. After Hiccup and Toothless reunite, Garff's father chased after them, who flew into a narrow cave. Struggling to keep up because of his sheer size against the cavern walls, he was soon sealed in by Hiccup and Toothless.
Several days after escaping, the Death Song was attracted by the Riders, who set foot on the island again, during the events of "Tone Death". He attacks them all at once, but a baby Death Song soon flies over and falls clumsily in front of him. Curious, the Death Song hums a little tune. The baby repeats after him. Dissatisfied, the adult quickly throws the baby against a cliff wall. He approaches the Riders, ready to eat them, but they begin singing a song collectively, confusing him. The baby Death Song joins in and the two dragons start bonding. Finally accepting of the young dragon, he adopted him.
Prior to the events in "Living on the Edge", the Dragon Hunters, led by Krogan, went to Melody Island and successfully captured this Death Song and left behind a badly injured Garff. The hunters then used the Death Song in order to capture other dragons, especially Singetails.
After enduring months of captivity, he is eventually freed and reunited with Garff during the events of "Family Matters".
This Death Song is large in size. His body and underside of the wings are a bright striking yellow. He has circles of a pretty blue on his wings, and a blue fin on his tail.
During his first appearance, this Death Song is highly territorial and very aggressive towards anyone that intrudes into his territory, often seeing trespassers as potential meal. But when he meets his adopted son Garff, he gradually softens and shows that he is a caring parent.
Singing: Like any other Death Songs, Garff's Father is able to sing to lure other dragons into his trap.
Firepower: Like all the Death Songs, Garff's Father spits an amber-like substance to trap other dragons.
Strength and Combat: This dragon has powerful muscles, as he has been shown to lift up medium-sized dragons such as a Gronckle. He can also disconnect the amber substance from the ground with only its jaw. It was also shown that this dragon is able to defeat a smaller Thunderdrum by swinging its tail to the mountain and was able to hold it down with no difficulties despite its heavy weight.
Endurance and Stamina: The endurance of this Death Song is great enough to endure a Thunderdrum's powerful roar, able to endure boulder at high speed and crash into a terrain wall and still able to fly high speed without any difficulties to chase a Thunderdrum and Toothless for long period of time.
Speed and Agility: This Death Song has shown to be an extremely fast dragon. He has been shown to be able to swing its tail around against its enemies but has a lack of making quick turns when chasing at full speed.
In "Tone Death", when the riders came again on Melody Island, Garff's Father broke free from the cave in which was trapped. When they enter the cove, the Death Song ambushes and traps the riders. Garff and the adult dragon start bonding, but when they start roaring, Garff's Father quickly hits the baby away. The riders realize that Garff has been singing all their songs, instead of the Death Song call. The Death Song attacks the riders, who start singing, and Garff imitates them. The adult dragon looks at Garff and finally takes off with him right behind.
Garff's Father considers Hiccup prey, as he tries to capture him in amber many times. He may have a grudge against Hiccup, as he, Toothless and Earsplitter worked together to free its captive dragons and trapped it in a cave.
When the riders arrived in Garff's Father's cove and encountered the Death Song, Toothless was ready to fight him. However, because he couldn't fly, Toothless was trapped in amber. Later, when the Night Fury was freed, Garff's Father chased after him and Hiccup in a cave and was trapped inside with the help of Earsplitter.