Hi

I'm running a campaign centralized on Dark Elves (as antagonists). Where to find online / book resource material on those Slaanesh-loving cousins?

I've read "Defenders of Ulthuan" Warhammer novel (which was great!) to do some research.

Arto

Drucchi or Dark Elves are not chaos worshippers though they are thoroughly evil. Read the Malus Darkblade series to understand them better.

Thanks for the tip - I'll read that.

There is no dedicated product available for Dark Elfs for 3e (nor for 1/2e I think?), but The Creature Guide and Vault has a section on them along with a bunch of NPCs and actions.

Best source is the Dark Elf army book from Games Workshop.
It is loaded with background material, great images, and heroes etc. plus you can use the various army types - Blackguard, Witch elves, Reavers etc. to form character classes for them.

The High Elf one is also good if you need their point of view too.