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.

These creatures might be less considered independent entities and more simply part of The Destroyer itself, such as how Dauf's projectiles are formed from his body.

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

Its been shown that the infected victims (at least those who are Awakened Beings) also go through a variety of changes to their physical bodies (Beth and Dauf) and obtain a massive boost in their power and managed to maintain a degree of intelligence. However due to the Destroyer's destructive impulses, the infected Victims are seemingly infected with its desire to destroy everything and seemingly go wild trying to destroy all living beings in its surroundings.

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. The effect was akin to her awakening and, despite a critically altered form, retained a certain degree of herself, albeit she was still inflicted with the same destructive impulses as the Destroyer. As seen where she tried to kill both Yuma and Cynthia and critically injured Cynthia and later would insistently fight against Priscilla and refused to back down despite being obviously being outclassed and despite the latter's attempts to have her stop.

However despite this, its shown that Beth still retain her close relationship with her sister and continued to help and protect as much as she could. Later upon Alicia being killed by Priscilla, Beth would openly weep in grief for her and later would attempt to avenge her in homicidal rage.

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. Whether from the effect of the rodes or his own rage, Dauf mentally changed into a feral beast, even allowing Riful's remains to be harmed, only able to target Priscilla. The rods seemed to increase and restore his lost strength, and managed to, if very temporarily, overpower Priscilla.

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, along with the rods as material to revive three of the most powerful Claymores as new Creatures of the Abyss; thus Raki was spared.

Abyss Feeder
Unlike the others, the rods have no physical effect on the Abyss Feeders; they have no personalities or sense of self for the rods to control. Instead, infection drives them into a ravenous frenzy, overpowering any psychological blocks established. This makes Abyss Feeders start targeting Yoma in addition to Abyssal Ones.

Priscilla
Priscilla was seemingly immune to the rods infectious properties do to her immense level of Yoki. This is seen where she was repeatedly stabbed/made contact with both the gigantic Rods and the miniature rods that are released from the infected and spawned creature.