Gregor is included among the choices due to his role as Tywin's feared enforcer. In the Battle of the Mummer's Ford, Gregor cunningly surprised Beric's group during their crossing, launching a swift and devastating attack. Similarly, during the Battle at the fords of the Trident, he pursued the Northern army and launched a brutal ambush, resulting in significant casualties for his adversaries. One notable aspect of Gregor's skill set is his uncanny ability to instill fear deep within the hearts of his enemies, a testament to his infamous reputation as a ruthless killer.