Wizardry V: Heart of the Maelstrom

After L'Kbreth's Orb was used to bring peace back to the land of Llylgamyn, a new threat emerges in the region. Strange malevolent energies have been spotted beneath the Temple of Sages. These energies - called the "Maelstrom" by the local inhabitants - can be sealed by a person known as the Gatekeeper. Unfortunately, the latter has been imprisoned by a mysterious power or person only referred to as SORN. A party of brave adventurers seeks out the high priest G'bli Gedook, the guardian of L'Kbreth's Orb, who explains to them that they have to release the Gatekeeper and eventually vanquish the evil at its core.