The module in question is from 3.5 era Hard Point 4 – 6 Sacrifice of Generations Written by Henry Lopez.
The Gatekeeper will grudgingly reveal that a rarely
used Portal sits just northwest of Paldaris on the coast
of the Sea of Coryan. He warns the players that this
Portal once sat on the outskirts of the cursed city of
Kofan and that they must vow not to enter or explore
the ruins so as not to stir up the ancient evils that reside
there.
