Purple Rain

The worm was pinned inside the tunnel with Typhon continuously using his earth spikes to pierce into its wounds to stop it from breaking free.

But it wasn't enough to hold it down for long.

As soon as the giant worm realised it was trapped, it had begun to bash through the spike impaling its lower body with brute strength. Typhon extended more spikes in their place, but under the creature's fierce struggle, his spikes were being destroyed as soon as they came out. 

My instinct was to fire off poison blades to keep its wounds open, but that would force it to escape underground. 

It wasn't very smart, as it was focused on fending off the attacks that poked at its wounds instead of eating its way out of the tunnel wall. I could only imagine Typhon's spikes made it unable to think properly. 

On closer inspection, I saw the wounds on the worm's lower body had stopped bleeding and a part of the wound was already covered in pale grey tissue.