Gargon

His mother was a green dragonborn and was seduced by Hexion - God of Medicine. Shortly after Gargon was born, his mother was hit with a deadly plague and perished. This was of course the doing of the god of sickness. Gargon build The Citadel Of The Sun but when he died during The Battle of the Gods (TBOTG), the citadel sunk into a huge rift and became known as The Sunless Citadel. Around a thousand years later a druid named Belak finds the corpse of Gargon. He uses the remains to create The Gargon Tree which produces a single fruit every solstice. At summer solstice, the fruit cures any illness if consumed. In the winter, the fruit is deadly. The fruits contain a few seeds that grow into Twig Blights. A living creature will be consumed over 24 hours if it gets bound to the tree. This will turn the creature into a thrall of The Gargon Tree.