Adamantine is the "Commander in Absentia" for Les Heroes de Paris. He disguised himself as street vendor who recommended the cafe le Rose et la Plume, to The Thing. When Grimm sat down a mechanism lowered him into their secret base. Adamantine explained that he was the vendor and the team needed his help in battling l'Empereur du Monde Souterrain who had assembled an army of rock monsters. He was preparing to order them to tunnel directly under Paris, destroying the city. The Thing, moved by memories of "the good old days" when you knew who the heroes were and all they had to do was go beat the tar out of a bad guy, agreed to help.
They battled past the rock monsters, le Vent used his super-speed to send the Thing flying directly to l'Empereur's tunneler. He destroys the machine, and causes a powerful explosion which triggers a cave in. Grimm and Les Heroes escape the destruction and allow l'Empereur to be released into the custody of his estranged girlfriend since he had done no real damage. She takes him back due to his dedication and agrees to marry him.
Powers and Abilities
Adamantine's powers were poorly-defined, but he seems to posses flight, super-strength and durability, as well as skill in disguise.