Fighting Tyrant Wraith

The Tyrant wraith is a little distance away from me, but I could still see its features. It is a fifteen meters long snake; it has red-grey ghostly scales all covering its body.

It is not that strong, barely entering the Tyrant stage, but that's not the question. The question is how to kill it. I had killed ghouls before thousands of them but never killed a wraith; though I read about tens of methods to kill them, I don't know which one to use on it.

Chew Chew 

While I was thinking, Ashlyn chirped loudly, and metallic shin covered her body, and before I could say anything, her tiny body burst into silvery flame, and she moved like a superfast beam toward the tyrant wraith snake.

"ROARR!"

It let out a huge roar, but soon that roar cut off as Ashlyn directly went inside its huge head and came out the next second, holding a thumbnail size Red-Grey marble in her hand while the wraith Tyrant behind her turned into mist.