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Just had a couple quick questions about the Reaper's Wager detachment. It really looks like a fun detachment and has kind of rejuvenated my interest in my dark eldar army. Was thinking about picking up a bunch of harlequins, but before I did I wanted to ask. Can you still use grotmas detachments after an army book comes out? I know the army book rules supersedes all rules before it came out, and grotmas detachments usually aren't in the army books. Do you think rules for harlequins will be in the new dark eldar army book? If not, do I use the rules for harlequins from the downloadable index, or from the craftworld eldar army book? I should probably just wait until the dark eldar army book comes out, but some of the questions still stand either way. Thanks for any info!

Yes, you can use Grotsmas detachments in a new Codex.
Not sure for the rest.

The Grotmas Detachments are good for the duration of 10e.

There is no Harlequin index anymore. It was removed when the Eldar codex arrived. So you use the rules found in the Codex.

If the Drukari leaks (that I've seen) are accurate there's no Harli rules in the coming codex.

Here is a full review of the new codex:
From what I can see Reaper's Wager is the only way to use harlequins.

Once the Craftworld Codex came out, Reaper's Wager was the only way to do it. Allying in Harlequins was part of the army rules for Index: Eldar, and that option was removed in the codex.

 BorderCountess wrote:
Once the Craftworld Codex came out, Reaper's Wager was the only way to do it. Allying in Harlequins was part of the army rules for Index: Eldar, and that option was removed in the codex.

The ‘Corsairs and Travelling Players’ rule that lets you add Harlequins and Corsairs was added to the Detachment rules for both Index Drukhari detachments after the Craftworlds Codex came out, so *currently* you can take them in both those detachments still.

But looks like that will change after the Codex comes out unless they Errata it.