Originally Posted by
Zerref
Illidan laid the anchors down in Argus, the last one before his holy experience took him away. But he did use the souls to send the PC Illidari to Mardum, as he had to retain what strength he had left from the spell to fight the Raid.
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As far as his Warglaives go, it's a constant battle with Blizzard about it, King wanted to write about it, blizzard didn't want it in the book (some Q&A King had said this) Meaning Blizzard either wants to do the story themselves, i.e a new CoT instance, some flashback quest cutscene, or they just want us to ignore it. But the initial design was supposed to be two swords that were separated and combined into one warglaive, which i believe has a sentence in the WotA book that described it, but the designers had a different idea for them. So all in all it's a giant cluster of "we can't agree on what we were doing at the time".