Translated from the back of the book:
"'The Ban of Bastrabun'
In times long forgotten the legendary tulamidian hero Bastrabun erected a barrier that protected his people from the tyrannical saurian monarchs. But is this barrage still able to repel magical mischief from the east? Can Bastrabun's might match the onslaught of the Demon Master? And what about the strange creatures walking about *behind* the barrier?
'The Ban of Bastrabun' is the fourth part of the series 'The Marks of the Seven', a campaing co-authored by the most popular authors of DSA."
Additional user summary (contains spoilers):
Part 4 of 7 of the campain "The Marks of the Seven" about the return and downfall of legendary black wizard and demon master Borbarad.
In part four the heroes investigate the ancient magic of Bastrabun's Ban to ward off magical threats, only to discover a wizard creating a horde of chimeras.