While the Burning Legion invaded Azeroth, they were also at work here, in Outland. We have tracked their movements over the years, but this latest activity, <class> - well, this is beyond anything we've seen.
Seek out Sergeant Altumus near the eastern supply caravan. She has been monitoring the invaders and may have insights into their purpose.
Be swift - and take care, <name> - the Burning Legion is not to be underestimated.
Completion
Force Commander Danath may have misunderstood my request for reinforcements. You look capable, but... I asked for a full sized battalion!