From Below

From the introduction:

Part one of the series, “A Day in the Strife.”

Within the Wizard’s Cabal a new realization has come to manifest that the organization is not as powerful as thought to believe and unable to combat the forces wielded by Wizard King Goss and the Arcane Dominion of Raddai. With their most powerful spells beaten aside easily, a new source of power has been brought to the attention of the Wizard’s Cabal by the mysterious Trophimus of the Directory of Antiquities and that it could turn the tide of battle in favor of the Wizard’s Cabal and their allies.

A Dave Arneson’s Blackmoor adventure for heroes levels 4 to 13.