After the hand in of the 'Harness of Control' the Shardwurm Broodmother starts to move towards the giant fort as she should be. Once there nothing happened, means the 2 giants didn't pop and the Broodmother just stood there until she finally despawned.
Here is the quest description:
http://wiki.project1999.com/Crystal_...ient_Artifacts
Turn in this harness to the Shardwurm Broodmother.....
The Broodmother then walks out of the cave and heads to the giant fort. At the giant fort, two of the named giants inside the fort, Gralk Dwarfkiller and Fergul Frostsky, repop outside. Gralk engages the Broodmother and Fergul runs away.
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While the Broodmother fights Gralk, chase down Fergul and kill him and then loot Kromrif Military Leggings off his body. The Broodmother will kill Gralk, in addition he drops nothing if killed by players.