How do you kill it? I kept on dieing here.

Go in to one of the connecting doors and use a bow and arrow every time it comes by.

I held an ultimate technique and hoped he was headed at me, then he'd stop if I hit and I could combo him for a while, only bad thing is if he bites you.

I killed that thing finally when playing just now
I kept seeing the worm thing in a room.
So, I use a bow to killed him like that.
And also, I tried the ultimate technique one.
I could'nt hit him with it. And even if I did, he bites me
and kill me very fast.

I pulled it off with alot of air combos, mainly flying swallow when he got far away. Took out about half of his health with each combo before he'd run.

just UA with the sythe, it works great, you dont get hit (assuming your in a room)
OR you can stand in front of the door hit it (w/ ultimate atk) then run into a room

quote hollowedsol

just UA with the sythe, it works great, you dont get hit (assuming your in a room)
OR you can stand in front of the door hit it (w/ ultimate atk) then run into a room

Yeah the worm gets stunned right after you launch the UA so you can rush back into a room.
But I'm getting to experimenting other UA to see if weapons like the Dragon Sword and Lunar and do the job as well.

Are you talking about those snakes that have skulls? If so, in the path of the warrior at least not the bow nor the ultimate techniques will do. The arrows don't hurt that much and they can spit acid on you. The ultimate technique, like hell you will be able to concentrate enough energy as they are too many and you still have the acid pool on the floor that drains your hp. After alot of tryings I must say that air combos and luck are the best to beat them. Truly the most dificult enemies in the game.