Basilisk Canyon

From publisher blurb: Basilisk Canyon is a Fifth Edition plug-in adventure for four characters with an average party level (APL) of 3, 5, 8, or 11. This addon offers details for each level and makes adjustments accordingly. The adventure sees the party pass through the dreaded basilisk canyon, a narrow pass through a mountainous or arid area choked with all manner of dangerous monsters, including the eponymous basilisk.