They look like sharks and like Raziel, eat souls to replenish their energies. If Raziel continued to lose his sentience, he claimed he would degrade into such creature.
"The Reaper Archon is the smaller of the two types of Archons. They are built more for speed and quickness than strength and prefer to attack while floating along the spectral currents they effortlessly swim through."[Defiance strategy guide] When defeated, Reaper archons fizzle and disappear entirely with a bloodcurdling scream.
The Dreadnaughts are the bulky ones suited for more ground combat and will attack Raziel and the Sluagh on the ground. The are immune to Raziel's telekinetic attacks while the reapers are not immune. These ones are built for strength and tend to knock Raziel a bit of distance when they attack, forcing Raziel to hit them to break their Soul Siphon-stream. When defeated, Dreadnaught Archons break apart and melt into a puddle of bright blue liquid.
- There is some confusion over the level of sentience the Archons possess. In game dialogue, Raziel comments that they are "mindless hunters" while implying they are devoid of any will of their own.[Defiance/1] Legacy of Kain: Defiance: Prima's Official Strategy Guide meanwhile labels them as "highly intelligent hunters"[Defiance strategy guide]
- For some reason the Archons do not appear in any other time period that Raziel visits, perhaps because The Elder God deems them unnecessary for the time period.