The Death Imagin is an Imagin created by Kai to command his Imagin army and a major antagonist in Kamen Rider Den-O, serving as the main antagonist of Den-O's final arc.
The Death Imagin was created by Kai from all of his remaining memories to lead his Imagin army. The Imagin army was sent to kill Hana, the key to the Junction point, in the process laying waste to the city.
The Death Imagin soon confronted the Kamen Riders, combatting and overpowering both Den-O Liner Form and Zeronos Zero Form. The Death Imagin was eventually destroyed by Den-O Sword Form and the combined energies of all the good Imagin as well as Zeronos, causing Kai and all of the Imagin that he had made contracts with earlier to dissolve into sand.