Slimes from Another World Also Want to Become Immortals!

(Double world travel, starting with a different world + no system) Yang Hui died suddenly at a young age and traveled to a different world with swords, magic and beast control. Good news, the birthplace is Novice Village, and this forest plain is full of slimes. Bad news, I also turned into a slime, and the plot started to come within a few days. The good news is that he has two crystal nuclei from different worlds. One is used in the world of immortality, which allows him to gain the ability to travel through time and practice skills. The other is used in other worlds, skills, upgrades... All in one! So, start with slime to devour, mimic, strengthen and become invincible.