Borehole

The Borehole is a cave located north of Falador. It is where Vorago can be fought.

After jumping across the three floating rock gaps and running a short distance, a waterfall can be seen along with Vorago. To enter the graveyard, right click the entrance to the cave.

Trivia

 * The dungeon was released before Vorago, as a teaser. Players could enter the dungeon, and it would shake 3 ticks after going in. After 10–15 ticks the player would be thrown out by a "mysterious" force.