|The one who summoned the invader from another dimension was none other than Taranza, who plotted while hidden in apparent defeat.
He has summoned the giant mirror as his final weapon, gazing not only upon its shimmering surface but the dark shadows lurking within...
— cut-scene text from Team Kirby Clash Deluxe
The mirror resembles the great Dimension Mirror from Kirby & The Amazing Mirror, along with its counterpart in Kirby: Triple Deluxe, but bears a sharp black frame adorned with stars and varnish. Its interior is likewise a very dark hue, and seems to only poorly reflect light.
It is controlled by King D-Mind, a great evil combination of Shadow Dedede and Dark Mind from another dimension, who used it to influence Taranza, causing him to wreak havoc on the Dream Kingdom by unleashing all sorts of monsters. It is up to Team Kirby to track down Taranza, find the mirror, and destroy it by defeating King D-Mind.
Because Team Kirby Clash Deluxe takes place in a separate continuity, this mirror—and all beings associated with it—are not part of main Kirby series canon.