Twilight on the Planet of Fhere

From publisher blurb: On the mauve-dusted twilight planet watched over by the massive battlemoons of the Great Reaches of the Majestic V’ril Empire, the heroes and their new arachno-men allies are harried by Vril overseers. The heroes find that they have strange new powers and amazing abilities. Fighting on the run, the heroes finally take refuge in the enclave of the arachno-men, where they find a new enemy waiting.