During the quest A Glimpse Beyond, fighting the Scourging Blights.

They display as having 9 Armor, 7 Armor against Bludgeon/Burn, and Immunity to Lightning.

However, multiple attacks from certain weapons that deal Slashing and Piercing sources failed to do any damage, with the game telling me they were immune. This was contradicted by OTHER sources of Slashing and Piercing attacks dealing damage just fine.

The sources in question...

Slash damage from Lord Darryn's Voulge did not work, but Slash damage from Whispers of the Endless Paths and Mind Blades worked just fine.
Pierce damage from Thundercrack Pistol did not work, but Pierce damage from Hand Mortar and Minoletta's Bounding Missiles both worked just fine.

Lord Darryn's Voulge does Slashing/Lightning damage.
Thundercrack Pistol does Piercing, but also has a special effect of doing a percentage of its damage as Lightning.

Seems like a bug with their lightning immunity?

Edited May 27, 20196 yr by Korica

5 hours ago, Korica said:

Slash damage from Lord Darryn's Voulge did not work, but Slash damage from Whispers of the Endless Paths and Mind Blades worked just fine.
Pierce damage from Thundercrack Pistol did not work, but Pierce damage from Hand Mortar and Minoletta's Bounding Missiles both worked just fine.

Lord Darryn's Voulge does Slashing/Lightning damage.
Thundercrack Pistol does Piercing, but also has a special effect of doing a percentage of its damage as Lightning.

Seems like a bug with their lightning immunity?

Not a bug, but oversight. Those weapon's attacks tagged by Electricity keyword - it means they deal no damage at all to Electicity-immune targets. That's how the system works.

Like Phenomenum said, the game checks if an attack has the "shock" keyword.

Unfortunately all the weapons you mentioned that don't work do carry that keyword. It means that their attacks will get bonuses from stuff like Heart of the Storm (+1 PEN) and from shock Power Levels (e.g. from the armor "Deltro's Cage": +2 Power Level).

It also means the game totally ignores that they will (also) do non-shock damage (slash or pierce) and just dismisses the whole attack (including the damage) without further explanation.

Same happens with Dragon's Dowry (pierce damage but tagges with fire keyword - can't hurt burn-immune creatures), Essence Interrupter (shock/pierce, shock keyword), Frostseeker (pierce/slash, frost keyword) and so on.

I don't think it's fixable in any other way as to remove the keywords from those weapons. At realease they didn't have those keywords and honestly: the drawbacks because of this "bug" are more severe than the benefits I think. 

Edited May 27, 20196 yr by Boeroer