Parasitic Rods

The Parasitic Rods are referred to the projectiles shot from The Destroyer. The rods themselves can either take over their host (Whoever they hit) or transform on their own. A few characters have destroyed the rods before they can have an effect on them (Priscilla, Deneve), so it is possible to resist them.

History
Parasitic Rods were first seen and used in Claymore Chapter 94. The Destroyer has the ability to shoot out these rods which cause much destruction. They appear to be slightly larger than Isley's arrows when he was in his awakened form, being taller than a two story house as seen in the town Raki was at when it was hit.

Creatures
The Luciela-like creatures spawned from the rods are able to also shoot out more rods themselves (though on a much smaller scale), they also appear to have a limited life span dying off after their Yoki runs out. It's estimated they can live for a day or two before running out of Yoki, though the only known ones were in battle the whole time so left on their own may be able to last longer.

They appear to have abilities similar to Awakened beings being able to manipulate their bodies to attack but don't really seem to have much intelligence.

Infected
Those hit with the rods (Either the Destroyer's or the Creature's) have had different results but undergo some form of transformation.

Beth
Beth was hit through the stomach with one of the Destroyer's rods, and the rod forced her to Awaken,altering her Awakened form as it assimilated her. Unlike Dauf, she seemed to retain her human emotions, at the very least crying when her sister died.

Dauf
Dauf when infected became an enraged and uncontrollable monster. His Awakened form changed slightly giving him a more skeletal look. It was implied by Priscilla he deliberately let himself get infected by the rods. He forgets his love for Riful in his new form even allowing her corpse to be hit by Priscilla and then tossing Riful's corpse aside.

Raki
Raki was hit by the rod's but resisted the transformation with the aid of Priscilla's severed arm, which she imbedded in his back. The arm was later removed by the Organization, leaving Raki's fate and the result of what happens to a human hit by the rods is unknown.

Abyss Feeder
Unlike the others the effect the rods have on the Abyss Feeder 's are more psychological removing the limitations the Organisation placed in them (such as instead of only chasing after their prey will attack anything they want).

Priscilla
Priscilla seems to be immune to infection due to her immense yoki power.