The Sentinel Beam, referred to as an Unrecognised Incineration Beam, is a Forerunner Directed Energy Weapon used by Sentinel Aggressors.

Overview & Background

The Sentinel Beam is a beam-type directed energy weapon, primarily used by Aggressor-class Sentinels to contain Flood outbreaks. The weapon fires a glowing amber energy beam that is capable of setting unshielded targets ablaze.

When mounted on a Sentinel, the weapon draws power from the Sentinel's own energy supply. However, it contains a non-rechargable battery that can be used to power the beam in cases where the sentinel has been rendered non-functional.

Gameplay Information


  • The incendiary nature of the fired energy beam makes the Sentinel Beam highly effective against unshielded targets, especially Flood forms.
    • The Sentinel Beam will ignite targets if the beam strikes an area unprotected by Energy Shields or Armour. These flames deal additional damage and can finish off enemies without wasting the Sentinel Beam's battery power.
      • Ignited enemies will still drop grenades on death, which can take out additional enemies if they're cooked off by the burning corpse.
  • The Sentinel Beam has near-perfect accuracy which persists with its practically unlimited range, meaning it can be used as a makeshift sniping tool despite the lack of a scope.
  • The Sentinel Beam utilises a "Regenerating Magazine"; Instead of reloading or overheating, the weapon will passively refill its cache of usable ammo when not firing. Unlike Covenant energy weapons, the Sentinel Beam does not overheat after discharging the entirety of its magazine.
  • The Sentinel Beam will always have a full battery upon being acquired from a destroyed Sentinel Aggressor.


  • The Sentinel Beam is extremely weak against shielded targets.
  • Unlike Covenant energy weapons, the Sentinel Beam's battery cannot be recharged from a charging station, the meaning the weapon must be discarded or replaced once the battery has been depleted.
  • The Sentinel Beam cannot be obtained anywhere except fallen Sentinel Aggressors.

Developer Information



  • When picked up, the Sentinel Beam is referred to as an "UNRECOGNISED INCINERATION BEAM" by the HUD, presumably since the UNSC have not previously encountered and/or classified the weapon.
  • Interestingly, the way the Sentinel Beam is attached to Sentinels implies that the Master Chief is actually holding it upside-down.
  • While the Sentinel Beam's magazine can only fire 15 battery units, the weapon will drain more units when a single burst is fired. This is because the weapon's magazine is being constantly recharged even while it's being fired.
  • It is unknown if the weapon's incendiary properties are the result of modifications made by 343 Guilty Spark prior to the Battle of Installation 04, or if they are a standard feature of the weapon in SPV3's version of the Halo canon.



vde Forerunner weapons in SPV3
Sentinel BeamSentinel Sniper BeamPulse Laser Suppressor (Unusable)Incineration Cannon (Unusable)