Aeteperax the Green Dragon
A large green dragon roamed the kingdom looking for a way to gain power. He came across an ancient artifact known as the Silver Egg of Bel in which he found the lost soul of an ancient black dragon named Aeteperax who was famous for destroying the gnome city of Errbiddle in the past and dying in the legendary battle against the female gnome paladin Tula.
The green dragon took on the name of Aeteperax used illusions to be the dracolich of the dragon of legend but when investigated by a adventure party he was robbed of the silver egg and his own personal horde. He died in battle against the adventures and his truth was reviled.
His hordes of kobolds and demons vanished after his defeat and the egg whereabouts is unknown.