EN 0 Damage: Bug?

For some reason, many enemies start taking zero damage from my attacks for a few seconds. I'm currently trying to do Finding the Bloodstone in hard mode and some of the skelks are also taking 0 damage, as well as some Charr and Destroyers...

I've taken a look at the Skelk's skill bars and none of them has a skill that reduces damage to zero...so am I missing something or is this a bug?

EDIT: I realized that Gadd uses a skill that makes an enemy resistant to all forms of damage excluding lightning, but what about the other times outside this mission?

Is not a bug, is the NPC (Gadd) that uses "Iron Mist" preventing them from taking damage.

As per wiki: "Gadd uses Iron Mist, occasionally preventing enemies from taking damage from any source other than lightning."

This has happened to me farming Charr in Nolani Academy as well. Its more common in GW:EN from what I have experienced, but seems to happen in other areas. Although I don't remember which creatures, it happened to me in Sulfurous Wastes. Kinda scared me when a Wurm Siege did zero damage.

I have noticed that degen will work though. While Wurm farming and Charr farming I don't have anything for degen, I know that bleeding, burning and poison allowed me to kill some Charr in Rragar's Menagerie that were taking zero damage from my attacks.

Shield of Absorbtion will also reduce all the damage to 0 in some sutiations

Yeah, this just sounds like skills. Almost certain it's not a bug.

One of the Margonites Abaddon skills reduces damage to 0 as well.

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