Ultra: I, the Monster Sage, am invincible through sacrifice

(PS: This book is also known as "Is it strange that I can only sacrifice monsters and have only monster skills?")
Wen Liuyun accidentally traveled to the Ultra World and also has the bloodline of Leonix, but his bloodline is pitifully thin.
Not only would this purity of Leonicus bloodline prevent Wen Liuyun from conquering monsters, but it would cause him to be hunted down by the monsters.
Just when Wen Liuyun was about to be killed by the monster, he suddenly awakened the monster sacrifice system.
As long as he keeps sacrificing monsters, he can gain the special abilities and powers of these monsters.
Then a very strange Leonics appeared in the Ultra Multiverse.
He travels through many parallel universes like a war correspondent, quietly observing one battle after another.
After the Ultra Warriors defeated the monsters and left, Wen Liuyun sacrificed the remains of the monsters one by one.
[Ding! Congratulations to the host for sacrificing Hyperzeton, gaining all of Hyperzeton's special abilities, and physical fitness +20000 points!]
[Ding! Congratulations to the host for sacrificing the Void Monster Greeza, and obtaining all of Greeza's special abilities, and physical fitness +10000 points!]
[Ding! Congratulations to the host for sacrificing Arc Belia, and obtaining all of Arc Belia's special abilities, and physical fitness +15000 points!]
[Ding! Congratulations to the host for sacrificing the original alien beast: TheOne, and obtaining all of TheOne's special abilities, and physical fitness +13000 points!]
A few years later, a Leonix with a lot of monster skills suddenly appeared in the universe. People called him: Monster Immortal