Hotfix for November 20, 2010
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Here are the update notes from a hotfix that was pushed live this morning (from the patcher):

    *** Hotfix ***

    - Kyluc in the Feerrott has added Spell: Protection of the Vale to her list of wares.
    - Some of the inhabitants of Morell's Castle and Sanctum Somnium have become more resistant to slows.
    - Zonoraz in The Grounds will no longer heal herself or wipe her hatelist if you damage her too quickly.
    - Ambushers will now correctly spawn at certain points of the quest Dissolution of Reason.  These ambushers will now depop if left idle long enough.
    - Alys, an unknown entity, and Piper Nasscul should no longer assist other NPC's in the Hippity Hoppity Kill mission.
    - Creatures in the Hippity Hoppity Kill mission will no longer summon at 100% health.
    - Creepy Alys should no longer despawn if she's left idle too long.
    - Added key drops to the Fear Itself raid that will be needed for further raid access in the House of Thule expansion.