The Tower of Lore

From the Introduction

The Tower of Lore is a short adventure for four 8th-level characters. Nearly any mix of characters will work, but the adventure consists of four sequential encounters, so a cleric or another source of recuperative magic is extremely useful. The adventure should prove a reasonable challenge for characters from 7th to 9th level. The adventure is set in a quiet area of the Duchy of Urnst in the Greyhawk campaign setting, but can be located almost anywhere within a day’s travel of a small village. The adventure uses "The Old Tower" map from the October Map-A-Week web feature.