Board Thread:Warhammer 40k General Discussion/@comment-121.219.152.237-20130611141910/@comment-4264245-20130611155119

Exodites do need and use spirit stones, since Slaanesh craves for the souls of all Eldar (Dark Eldar simply try not to die, either by vampirising life energy from others' pain, or by being rebuilt by Haemonculi). The difference is that they don't have Infinity Circuits, but Worldspirits, which are hidden structures of Wraithbone where they put their dead's spirit stones =)