From the first page of the PDF:
Netheril has taken over Spellgard – Saharelgard, as they name it now – and are controlling its oracle, the lady Saharel. With reinforcements on the way, soon the pass will be closed and the secrets of the fortress will be theirs. Only a 12 hour window is left to liberate Saharel and prevent the Shades from achieving a major victory. A Living Forgotten Realms Battle Interactive set in Netheril for adventurers of the Heroic and Paragon tiers (character levels 1 – 20). This adventure is designed to run in two very full rounds (11 hours total play time including a one-hour break).
This adventure is combat-intensive. Players who do not enjoy combat encounters are less likely to enjoy this adventure. It is recommended that at least three of the characters be members of the same Adventuring Company. This adventure may only be run at Wizards Play Network (WPN) Public Play events. It may not be sanctioned for Private Play.