From Halopedia, the Halo wiki
Warlord Pavium is an architect and siegemaster, making and unmaking fortifications at Atriox's command. Given the epithet "The Unbreakable" for his implacable discipline and prowess in combat engineering, Pavium's skill is unimpeachable, but conflicting ties of loyalty to his clan and brother has slowed advancement in the Banished. Eager to prove his worth, Pavium has redoubled the efforts of his pack since their setback on the Halo ring. His efforts have not gone without notice, and Atriox has tasked Pavium and his brother with a mission to judge their worthiness as members of the warmaster's inner circle.
Pavium is a traditional Jiralhanae combat engineer, taking to the field of battle as an engine of destruction, smashing enemy lines as part of the pack's vanguard. His panoply of war always includes his custom warplate gifted to him by Decimus. On the battlefield, Pavium is a walking tank armed with a Heavy Mortar System for direct bombardment and a Target Designator for calling out high-value targets for combined fire. Targets painted by Pavium's designator can not benefit from stealth and take additional damage. This effect continues until the painted unit dies, moves out of range, or Pavium cancels the ability. Upgrades include Designator Shells, which temporarily paints targets hit by his mortar and an Advanced Designator, which also paints the enemies close to the main target.
Pavium specializes in a defensive strategy which combines Mega Turrets, powerful Ultra Mines, and orbital Rain of Fire to secure basing sites. Once established, he increases the output of buildings with Burnout and tears down damaged or inefficient structures with Full Salvage recycling. During grueling attrition battles he outlasts the enemy with Enduring Will to create a long-lasting healing zone while simultaneously striking deep behind their lines with Wraith Invader and Lich Vanguard. All of this is monitored using his Orbital Designator.