Four Against the Netherworld

Publisher's blurb:

Four Against The Netherworld is a supplement for Four Against the Darkness, for character levels 6-9.

In its pages you will find:

New classes: Demonologist, Cambion, Cleric of Zur, Cleric of Foryos, and a reworked Paladin;

A complete economic system for the Netherworld;

Rules for hex-based exploration, with plenty of terrain types, and a downloadable color map of the known regions of the Netherworld;

Six new spells for wizards and cambions;

New Reactions: Burn Souls, Capture, Conversion, Demonic Pact, Mercenaries, Demand Obeisance, and more;

Tables to generate encounters and events;

Plenty of new, deadly monsters, including randomly generated Lovecraftian aberrations.