For example, the Gargoyles that can never break through the purification barrier... or The Great Tree that can be ignited by ordinary flames.
A fourth-Level curse vulnerability is similar to the negative effects of the Red-Handled Sword. This value is roughly the strength at which a Fourth-Level Curse Master can curse a fifth-level Transcendent, but a Fifth-Level Curse Master cannot curse a sixth-level Transcendent.
"Could it be..."
Seeing the new effects added to the Defiant Flame Butterfly and the Night Fiend, Aleister guessed something.
Indeed, in the "Reverse Summoning" entry of the newly acquired, yet unused, King of the Wild Hunt Card, there was also an attribute added:
[Effect: When the King of the Wild Hunt enters the battlefield, summon the "Followers of Helquinn" from the Wild Hunt Legion to launch a charge]
——The Wild Hunt Legion!
This is just too awesome!