Halo what is the heritic

The heretics in all of the halo games are either you, or the heretic elites and grunts. The covenant call you heretic because you are "alien" to them. Originally, the Heretics were a Covenant artifact retrieval team attached to the fleet of paticular justice and led by Refumee . They were investigating a methane mine on the planet Threshold when the Pillar of Autum crashed on the halo. When the master chief, or spartan 117 destroyed Halo, the team was spared from death, unlike their compatriots on the ring.