drawcia soul
The second and true(?) undead form of Drawcia, fought at the very end of Kirby Canvas Curse. Here, she is significantly more monstrous, being a giant orb with five yellow eyes and fighting Kirby through rather unorthodox methods compared to his previous foes.
Intentionally or not, she kicked off the trend of final bosses gaining a "Soul" form, among which are Marx Soul, Magolor Soul, Soul Of Sectonia, Star Dream Soul OS, Void Soul (and possibly Void), and Chaos Elfilis.
This tag implicates drawcia (learn more).