You might have heard of undertale right? If not then go search it up. (it’s popular lol)
There’s this spec called sans. It’s annoying to fight because you can’t see their health bar. Their health is ran by something called stamina. They have a stamina bar that works like a health bar. If it runs out they die.
To obtain sans you would use a bone on standless, then you should get it.
If you want to make a bad choice and evolve sans into Xchara, find a xsoul and use it on sans. (why would you do it tho Xchara sucks)