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Don't really understand the whole 30k/40k rules...but are Medusan Immortals legal for Iron Hands in a Warhammer 40,000 game?

30K is a game similar to 40K that takes place during the Horus Heresy. The armies are compatible with 40K, however, they are different factions then their 40K counterparts. As such you have 30K Iron Hands, and 40K Iron Hands. 30K use the 30K stuff, while 40K does not have access to it.

cool thanks for the explanation. So just to clarify can a 30k Iron hands legally play another 40k army? Or does it require permission...or is it not legal at all?

This is all covered in the 30k rules. Do you have the rules?

 pr0wler wrote:
cool thanks for the explanation. So just to clarify can a 30k Iron hands legally play another 40k army? Or does it require permission...or is it not legal at all?

Strict RAW is that you can't play 30k armies vs. 40k without house rules, but the "two" games are 100% compatible and there's no good reason not to have that house rule.

From Forgeworld's Horus Heresy FAQ:

Q: Are the armies and units in the Horus Heresy books by Forge World meant to be used in
games against regular Codex armies, such as say Grey Knights or Orks?
A: While Forge World’s on-going range of Horus Heresy books and their game content are all
designed to use and be compatible with the Warhammer 40,000 rules, they have been fine-tuned and
focused on playing battles in the milieu of the Horus Heresy rather than in conjunction with the
Codexes representing warfare in the 41st Millennium, and this will remain the case.

Designer’s Note: This means that while you are, of course, free to have fun and play games against
your friends using any forces you like, and Horus Heresy forces will be broadly ‘a fair fight’ with
Codex forces of the same scale, certain rules anomalies and inconsistencies may be thrown up that
you have to deal with, although these should not seriously affect the game in most cases. (For
example, certain units, such as those with the Stubborn special rule are at a premium costing in
Horus Heresy armies over their regular Codex counterparts, owing to the results of play testing
within their own sphere.)

In terms of using Lords of War and the Primarchs, however, these are definitely not intended to be
used in standard Warhammer 40,000 games, but only in games where both sides use the Age of
Darkness Force Organisation chart, and the specific provisions within, and in games of 2,000 points
or greater.

Designer’s Note: So if, for example, you wanted to play a battle representing a narrative where the
Sons of Horus Legion fought Orks or Eldar during the Great Crusade, you could quite easily use
those xenos forces’ Warhammer 40,000 Codexes (possibly house-ruled to accommodate larger
squads) to proxy for their Heresy-era counterparts. In this case, however, both sides should be using
the Age of Darkness Force Organisation chart, with the army’s own Apocalypse level units and flyers
available as Lords of War entries following the guidelines found on page 184 of Betrayal.

Personally, I find it works best for the 40k player to use the 40k force org and army construction rules, and the 30k player to use the 30k versions. Otherwise, you're basically telling the 40k player that they don't get to use all their options, while the 30k player gets all theirs. It's hard enough trying to talk 40k players into a game against 30k as it is, sometimes.

Of course, in these new days of Necrons, Eldar, and formations everywhere, 30k ain't got nothing on 40k. Even Primarchs think twice when they see ImperialKnights, Wraithknights, and Wraithguard.

Pretty easily summed up by saying 30k and 40k can't mix units nor ally.

You can play 30k versus 40k. 2k points and below, 40k will win most of the time unless the 30k player is pretty savvy.

An important note... For 30k, Lords of War are not allowed till 2500 points. That includes Primarchs.

It's totally at your opponent's discretion. Given the structure of points costs within a given Codex if may be more fair to require that the 30k units be treated as from a separate Faction, but still and AotI. In other words, put the 30k units in their own Detachment to ensure fair points cost. That said, there's very little hard data on the subject. You should find some willing opponents and write us an article!

 Tannhauser42 wrote:
Of course, in these new days of Necrons, Eldar, and formations everywhere, 30k ain't got nothing on 40k. Even Primarchs think twice when they see ImperialKnights, Wraithknights, and Wraithguard.

Yeah. 30K has some powerful stuff, like the Sicaran (which is also available in standard 40k) and Vulkan (who is a LoW and who by Age of Darkness RAW is not permitted in battles under 1700 points), but 40K has way worse stuff.

Vulkan will laugh if you try to kill him with most normal weaponry, yes, but he dies like a chump to D weapon sixes like everyone else.

30K armies also commonly use large blobs of MEQ (they are very expensive in small squads), and as we all know large blobs of MEQ is not very powerful in 40k.

 Owain wrote:
It's totally at your opponent's discretion. Given the structure of points costs within a given Codex if may be more fair to require that the 30k units be treated as from a separate Faction, but still and AotI. In other words, put the 30k units in their own Detachment to ensure fair points cost. That said, there's very little hard data on the subject. You should find some willing opponents and write us an article!

I can offer some "hard data." I've played my Pre-Heresy Emperor's Children in five games so far, all against 40K armies. Only won once so far, lost horribly in the others. Admittedly, EC are considered to be among the weakest of the Legions. Admittedly, I haven't busted out any of the really big boys yet (Fulgrim or my Glaive).