Shrewd is an earth pony agent of the Enmity Organization.
Shrewd is somewhat quiet, short-tempered, aggressive, and brutal. He is part of Enmity's muscle. He possesses incredible strength. Shrewd is virtually unstoppable; there is along nothing he can't do with brute force. He sometimes works under the command of Riff Wrath.
When Shrewd was created, he was meant to be Sir Sheath mild-mannered brother. But that idea has been discarded, and Shrewd has been reimagined as a thug for the Enmity Organization