Hordes of Dragonspear (FRQ2), softback Forgotten Realms adventure for AD&D 2nd/2.5th edition, by William W. Connors
“Dragonspear Castle. All who live within several hundred miles have heard the name and know its import. Once home to the proud and the brave, it stands now a ruin, cloaked behind a history of murder and diabolic plots. Few go there, for the only reward to be found is death.
Rumors abound that Dragonspear holds a portal to the sinister planes, but until now those have been unfounded. Following a great battle-against orcs and trolls from the High Moor who had taken possession of the castle, a temple to ward against further evil was established. However, by the Time of Troubles, that temple and its clergy had disappeared. Now, a horde of fiends and monsters has amassed at Dragonspear Castle, and is terrorizing the surrounding countryside.
The portal is active, that is for certain. The army of Daggerford needs reinforcements! Is your party made of the stuff of heroes?
Hordes of Dragonspear can be played using either the BATTLESYSTEM miniatures rules, or the quick combat resolution system found in DMGR2, The Castle Guide. Alternatively, a few simple changes render the entire module playable without any special rules.”