I see these special rules mentioned a lot, but I can't find any definitive source for them. Expendable and Resolute is explained in the Onachus list (I think), but frenzied is just mentioned in the BA list in the NetEA draft without explanation.

What's the source for these rules?

Resolute is used in the Dvergatal list in the squat section found here: viewtopic.php?f=86&t=19085

Onachus seems to have adopted their own version of the rule after the fact. I really do think both should come to an agreement. Personally I do not see what is wrong with the Dvergatal version (which selected the name first). Otherwise one of them should adopt a name change as it is confusing. This thread is evidence of that.

It would make sense if Onuchus adopted the 9.2.1 version name of the same rule.

As for Frenzied - that may change again. It was the effort to combine the abilities from the Blood Rage rule found within the World Eaters list. Look at that list and I believe that it will make some sense then.

Hope that helps

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So it's only defined inside army lists? The Chaos list is a bit confusing as daemons are expendable, but there's no definition of it. A problem with the Chaos list maybe.

When the netEA armies book comes out it will have the new universal special rules defined all together.