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 Furyou Miko wrote:
The Taros Campaign was featured in the Tau codex, so the codex writers clearly think that it was 'canon'.

Also, I'd never even heard of Mymeara Craftworld before their FW intro, but they're now mentioned in the new Eldar Codex, and what little is said in there is consistent with the FW IA book.

shade1313 wrote:

 Furyou Miko wrote:
The Taros Campaign was featured in the Tau codex, so the codex writers clearly think that it was 'canon'.

Also, I'd never even heard of Mymeara Craftworld before their FW intro, but they're now mentioned in the new Eldar Codex, and what little is said in there is consistent with the FW IA book.

Though the Tau commander from Dark Crusade is also mentioned in the Tau codex, but Dark Crusade has notable issues with canon.

A nod from a codex doesn't necessarily make something 100% canon (emphasis on the 100% part, there).

Vaktathi wrote:The Astartes' mandate applies to any Imperial military action, the Sororitas' mandate does not.

Says who?

Purely going by GW fluff now ...
"As we are all aware, the Order of the Argent Shroud are renowned for their mandate of regulating the activities of not just members of the Ecclesiarchy, but of other Imperial organisations they come into contact with as well."
- http://web.archive.org/web/20021004212519/http://www.armageddon3.com/English/Campaign/Troops/shroud.html

Vaktathi wrote:It could also just be a question of numbers. Given the numbers stated regarding their presence, the sisters may be even rarer than Space Marines amongst the Imperium, making their presence in any single battle very unlikely.

I'm actually one of the proponents of the "small numbers" thesis, as I'm going by the numbers provided in various GW sources rather than applying a sort of broad formula where "more powerful = less numerous". Still, it's not like you have a Cardinal fall from grace and drag an entire world into heresy every day. With how Vrak's importance and the incident was presented, it just strikes me as odd that you had several Chapters of Marines show up - but not the Sisters, who would have had cause not just in the pursuit of their duties, but to avenge their Sisters who were already on Vraks and surely presumed KIA as soon as word of the rebellion got out.

Vaktathi wrote:Really though, given the nature of the battle portrayed by Forgeworld, I just don't know what the Sisters would have done. They aren't into attritional attacks on fixed positions over open ground, artillery duels, orbital insertions or siege warfare and that was pretty much the nature of that war.

Actually, that depends. Whilst it is true that they supposedly keep their drop pods stored for when they have to strike against Space Marine Chapter Fortresses, their Seraphim are quite capable of deep-striking out of dropships. Alternatively, they are the core around which the masses of Frateris Militia mobilise.
Either way, I suspect they would have done the same on Vraks they did on Armageddon. Which was pretty much attrition-focused warfare as well. They work best as an elite force-multiplier deployed in co-operation with the Guard ... just like the Space Marines.

It would have easily been possible to write them into the scenario, and given the "plot" I would have expected it. But as I said, FW did not exactly showcase a fascination with the SoB so far, given how "much" they are featured in previous Imperial Armour books or their shop.