Tiergan utilizes Indurite in order to transform into Granite, his Black Swan alter-ego. As mentioned in Book 4: Neverseen, he consumes this chalky powder when needing to switch identities. It causes his body to crystallize and harden, making him look like a talking statue, which is one reason why he is called Granite.

It can be noted that Granite is an anagram of the name Tiergan.

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