You'll want to take this to Stormwind right away. Proud as I am that this keep and harbor bears King Terenas Menethil II's name, we are a calm harbor in a very nasty storm of enemies. It's just not safe here. The Dragonmaw in particular would sacrifice much to loot something like this... and I shudder to think of what they'd do with it. Don't bother going up the chain of command on this one, lad. Go straight to Highlord Fordragon with this. He'll know where it will be best kept.