The Jagdtiger was a German heavy tank destroyer of World War II. It was developed in 1944 as a response to the increasingly heavy armor of Allied tanks. It was armed with a 12.8 cm Pak 44 L/55 main gun, the same gun used on the Tiger II,
From Wikipedia
The Jagdtiger is a German casemate-type heavy tank destroyer (Jagdpanzer) of World War II. It was built upon the slightly lengthened chassis of a Tiger II. Its ordnance inventory designation was Sd.Kfz. 186.