Horde Silithyst Sentinel
This NPC can be found in Silithus (3).
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
Tip: Click map to zoom
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Silithus
Silithus
Silithus
Silithus
Silithus
Silithus
Silithus
Anyway, you will see silithyst geysers randomly thruout the silthus zone, right click them to collect them.
This part is annoying as you can't stealth or mount or you drop it, and it slows you down. 
To cap the silithyst, take it the large horde icon on the map.
Coords are 51.69
If you don't have the a map mod, its directly south of cenarion hold, follow the south road out of town and then turn right when you see a red glow up in the air on your right. It should be about halfway between the hold and the bottom of your map.
Good luck, horde is up, lets win this!