From Halopedia, the Halo wiki
He is featured as a mini-boss in the Spartan-IVs' Warzone training simulations. 'Reiss is a boss to appear on multiple maps in Warzone Firefight, and drives a Temple Wraith. Tankmaster 'Reiss's Wraith is painted gold and has increased accuracy and health from a usual Wraith, and other wraith boses, such as a Wraith Officer. His Wraith cannot be boarded or hijacked. However, if it is disabled multiple times with an EMP, 'Reiss will exit the Wraith to fight with a storm rifle and grenades. His empty Wraith cannot be driven. Killing one will remove one of the bosses needed to complete the round leaving 2 more named Tankmasters to kill, and earn the player a Legendary Takedown medal. He is called in along side Tankmasters 'Lcmutee and 'Ahtulai, as part of an Armored Lance. All 3 tanks, and elites themselves, are identical.
List of appearances