hehe yeah, we do have a nice recipe in Norse myth, the leash that the gods used to chains the Fenris Wolf, some of it ingredients were the roots of mountains and breath of fishes and stuff like that, sure worked in the end, but when the Fire Giant comes and Heimdal blows Gjallrahorn the chain will fail, but that is when the world ends so I guess that should do great for good ol' Rex as well!