A CD-ROM version was released in 1994, featuring two additional levels with new monsters, and replacing text boxes with FMVs and spoken narration through CD-DA audio tracks.

In the beginning of the game Kirt finds out that he is not in fact human, but comes from a parallel world where there was a war raging between shapeshifters for centuries.

Kirt's mission is to stop the demons once and for all, but first he will need to awaken his innate shapeshifting powers, which is where the obelisks come into play.

The main character of Kirt was based on the name of the game's software developer, Kurt Schallitz, and included his brown leather jacket.

Maorin is a large, four-armed, cat-like creature with superior fighting skills and the ability to see things invisible to others.

Caun – A leprechaun-like creature who is a poor fighter, but can heal quickly, jump over obstacles, fit in smaller spaces and unleash a swarm of insects (needed to unlock a particular door).

Reviewing the game for PC Gamer UK, Gary Whitta remarked that "Underworld fans will lap [ShadowCaster] up — as should anyone thinking of toying with the genre.

"[8] The magazine later named it the 49th best computer game of all time, calling it "an admirable attempt to show that RPGs don't have to be boring, complex and number-heavy".

[9] In Computer Gaming World, Scorpia wrote: "Those who prefer the regular Ultima style of role-playing will probably want to skip this one.

"[14] Writing for CD-ROM Today, Trent C. Ward stated that ShadowCaster's "fantastic graphics, sound and storytelling ... completely immerse you in a virtual world both dark and wondrous".