From Halopedia, the Halo wiki
Instruments of vengeance.
The Enforcers are fast-moving, battle-hardened Sangheili armed with plasma rifles, plasma casters, and plasma grenades which can be deployed by the Arbiter in place of Jump Pack Brutes. They excel in hit—and—run attacks where they can rush in to attack with their plasma weapons and then disengage to allow their energy shields to regenerate.
Enforcers can also use their special Stasis Grenade ability to take targets they cannot effectively deal with out of action, and raid enemy bases to shut down production for a short time. They can be upgraded with an Arbiter's Champion to add an additional Sangheili warrior armed with a plasma caster.
Disgraced Sangheili have few options to recover their honor, even in death. Had Ripa joined with Atriox and thrown off the Prophets' shackles he had powerful tools to exploit Sangheili warriors seeking redemption. Though Ripa could not lead through loyalty or charisma as a general, as the Arbiter he could bind Sangheili with iron-clad oaths that traded unquestioning service as his vassals for a return to the rolls of honor.