Thornn was on a team of magical supervillains called Salem's Seven. They were foes of the Scarlet Witch and the Fantastic Four. All seven were the children of Nicholas Scratch and the grandchildren of Agatha Harkness. They were humans with magic powers who could transform into fantastic creatures with super-powers.
Transforms into a yellow demonic humanoid with large red thorns jutting from the arms and legs. He has the ability to throw explosive or stunning thorns.