What does Sysskarr want

Hint 1 of 7:

He is bothered by the Thunderer T. Rex.

Hint 2 of 7:

Thunderer is in the little dead-end area far north of the Barrab village.

Hint 3 of 7:

When you find him, you will see a rock on the ledge near him.

Hint 4 of 7:

Did you know you can climb vines?

Hint 5 of 7:

Climb the vines at the west end of the raised path.

Hint 6 of 7:

You can then get to the area above Thunderer.

Hint 7 of 7:

One grenade blast will dislodge the rock to squash Thunderer.