Reincarnation in Another World: I Cultivate Immortality in Another World

"Why can your sword fly?" "I don't know? He can fly." "..." Giant trees reaching to the sky, islands floating in the sky. Swords and magic, dragons and brave men. Have I traveled through time? I remember just walking on the side of the road when a thunder struck. After waking up, he was lying in a bamboo basket, and after traveling through time, he was thrown away? What secret is hidden under that giant tree? By chance, he actually embarked on the path to immortality. Am I actually cultivating immortality in another world?