I'm the One Who Died, but the Hero Went Crazy

Happy to die for the sake of her friends, Aryn the sorcerer succumbs to the poisonous breath of the evil dragon Kuntern. 80 years later, through the divine powers of The World Tree and her former adventuring companion Zephyr, Aryn finds herself reborn. Upon her awakening, she learns that her childhood best friend, Elkinas Pontiac, went insane after her death. Once the leader of their expedition, El is now a tyrant ruler, raising a child hatched from Kuntern's egg. Will Aryn be able to save him?