Translated from the back of the book:
"'Inebriation of Eternity'
Almost the entire east of Aventuria has been conquered by the black hordes of the demon master - and so far Borbarad has not intervened in the battle. The army of the empire and its allies is ready to wrest victory from its enemy or to perish defending the free lands. But yet the last lines of the alanfanian prophecies await to be deciphered; still it is unclear whose side the trolls may take and to whom the sixth mark will reveal itself.
Inebriation of Eternity is the climax of the campain about The Marks of the Seven and Borbarad's return. Contains a gameboard and unit markers to enact the titanic battle at Troll's Gate."
Additional user summary (contains spoilers):
Part 7 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 seven the heroes must find the trolls to convince them to ally with the free lands, before heading of to the third Battle of Demons and the final confrontation with the demon master Borbarad.