John Skelleyton

John Skelleyton (not to be confused with Sans Undertale) is a major character and optional boss in The Adventures of Lifing.

While he shares an uncannily similar appearance to Sans, they are not the same character. His brother, Jack Skelleyton, similarly to John, also shares a similar appearance to Papyrus.

In-battle
John, also similarly to Sans, only has 1 LIFING and can only do 1 LIFING of damage. However, he can attack fairly quickly, and can dodge attacks easily, making him quite a challenging foe.

Strategy
To defeat him, use Lifing's SKELKILL attack, which attacks 10 times in a row. However, that attack only does 1 LIFING of damage each time, making it utterly ineffective on any other foe.

The fight is purely RNG. Sometimes you'll kill John before he kills you, sometimes you won't. Good luck.