Wizardry VI: Bane of the Cosmic Forge (originally known as Wizardry: Bane of the Cosmic Forge) is the sixth game in the Wizardry series of role-playing video games. It was the first in the trilogy surrounding the Dark Savant, which was followed by Wizardry VII: Crusaders of the Dark Savant and Wizardry 8. The game was developed by Sir-Tech and published for the Amiga and MS-DOS in 1990 by the same company. Versions for the Super Famicom, FM Towns, and PC-98 were later released in Japan by ASCII.

Although based upon previous games in the series, David Bradley completely rewrote the system for this release. This is the first game in the series to feature full color graphics. The game is mouse-driven and ran with EGA graphics. It is also one of the few games in the Wizardry series that does not allow characters to be imported from previous games. The character creation and level-up process is more detailed than in previous releases. The player can choose from eleven races and fourteen professions. There are multiple skills divided into three categories, and magic is divided into six schools. Combat allows several different options, such as thrust or bash, depending on the weapon selected.

Wizardry VI is a first person, tile-based and menu-driven RPG. It includes many mythological creatures and people, both fictitious and those based on real life. The player may meet Sirens and Charron from Greek mythology, the Amazulu (a group of African warrior women, whose tribal name is derived from the Amazons of Greek legend, and the Zulu of Africa), and the Caterpillar from Lewis Carroll's Alice in Wonderland.

The player controls a party of between two and six people from numerous fantasy backgrounds, identical to those found in Wizardry VII: the Human, Elf, Dwarf, Gnome, Hobbit, Faerie, Lizardman, Dracon (a half-Human, half-Dragon), Rawulf (anthropomorphic dogs), Felpurr (anthropomorphic cats) and Mook (aliens that resemble Sasquatch, or the Wookiees from Star Wars). They have come upon a castle that has been abandoned for over a hundred years, and which is rumored to contain the Cosmic Forge, a pen said to control the destiny of time and space. It is said that whatever is written with the pen becomes instantly true. Additionally, nobody knows what became of the King, Queen and Wizard who once lived there. Once the party enters the gates of the castle, the gates close behind them, making escape impossible.

The party visits many exotic locations. The ruins of the castle and its turrets have become overrun by creatures such as giant rats, vampire bats and carnivorous vines, and its basement has become a den of thieves, pirates and other ne'er-do-wells. Once the party finds a path through the castle and into the mountains beyond it, they meet the hostile giants and dwarves who mine the rock there, and a tribe of warrior women called the Amazulu in the jungles nearby.

In the mountains, they free the spirit of the lost Wizard, Xorphitus, who used the Cosmic Forge to learn everything there was to know in the universe. By doing so, his essence was split into two separate beings: the ghostly vision that the party meets, who seems reflective and benevolent, and his insane and violent physical self who appears much later. Xorphitus explains that this was because the nature of man was to be divided, and to know all things constituted a breach of this natural law. As such, he was naturally separated into two beings, each containing half of the universe's knowledge. He warns the party not to use the pen as he did, because using the Cosmic Forge outside of the Cosmic Circle would cause the user to suffer its Bane: to have their desire twisted into a mockery of the writer's intent.

Using a pair of red rubies gained from their dealings and combat with the giants and dwarves of the mountains and the Amazulu of the jungle, the party gains entrance to the River Styx which runs beneath the basement of the castle, and is overrun by eerie spirits and the undead - and guarded by the three-headed dog Cerberus, in-game known as Spot. There, they eventually meet the lost King and Queen, and the King's lover, Rebecca. The King, having used the cursed Cosmic Forge to wish himself immortal, suffers the Bane of living forever as a vampire, unable to feel any human emotion. He attacks the party and drinks their blood, and leaves them weakened, but alive.

The party also meets the long dead Queen, whose spirit still haunts the world. She relates the story of how she was forced to be impregnated by a demon at the King's command, and after she gave birth to the half-demon creature Rebecca, the King took the young girl as his lover, then ordered the Queen put to death. Her vengeful spirit gives the party a silver cross and instructs them to use it to kill both the King and Rebecca.