Phoenix Logs/Banished Buildings/Living Barrier
From Halopedia, the Halo wiki
Colony has a suprising rapport with the Huragok ("Engineer") technicians, though the specifics of their communication are indecipherable to others. Among the results of their collaboration are a unique form of vehicle barricade containing a Lekgolo cluster and communicator, which can be drop deployed directly on the battlefield to both impede enemy mobility and extend the awareness of Colony and it's field commanders. Unfortunately, the lifespan of the Lekgolo is drastically shortened when abused in this way.