Signature Creatures

"Signature Creature" is a term, in story, referred towards powerful creatures that the protagonist of Duel Masters: Cobalt encounter along their story mode. As described by Knight, Signature Creatures are a type of creatures that the protagonists call out for in their time of need.

Types
An indication within the story is that there are two types of Signature Creatures, one type refers to ones that Knight gives out to you while the other refers to the complete form of the 9 creature pieces that you are tasked to find.