Through Twilight Boughs

From the front of the book:

The Tome of Twilight Boughs is a legendary book of powerful ancient Yuir rituals protected by cryptic magic. The tome, or a copy of it, has recently been found. A half-elf scholar believes he has decoded a portion of it and now invites adventurers to help verify the contents. But how exactly does one verify the contents of a book over 2,000
years old? This adventure is the second part of the Tome of Twilight Boughs major quest (which began in AGLA1-1 Lost Temple of the Fey Gods and will conclude in AGLA1-7 Twilight Ambitions). A Living Forgotten Realms adventure set in Aglarond for characters levels 4-7.