Just wondering if any more had cropped up?

We have so far at least 'Expendable' and 'Support Craft'

(As in special rules used accross multiple units and preferably lists).

Are there any more that people haven't used but would like to see listed for others to peruse? E.g. something like 'Jungle Fighter' - may use cover saves when attacking in an assault.

"Bloodlust" being discussed for WorldEaters and BA.

I'd say the "Indomitable" save-v-hackdown ability could have broad applicability, though now that the EC and World Eaters have given it up, it's not in high demand.

If we are going to accept that the core rules are locked, with little chance of getting them edited again, I think all these new universal rules will need adding to any lists that uses them in any case.

The Armies Book can contain a list of USR's in one location, rather than needing to re-iterate them several times.

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Yep, and yep.

The only units to use it are the Damocles and LR Prometheus, but Improved Comms would be a good USR.

Basically a commander in the formation can use the ability on any other formation on-table.

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I've always felt that rule is probably horribly abusable.

Various people have pointed out the variety of ways it isn't (for one thing, you have to end up in coherency, so there's a very practical limit on how far you can reach).

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The Apocrypha of Skaros 1.1
Rogue Trader Expedition 0.4
The Horus Heresy 0.5
Night Lords 0.1
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It is abusable for a very high speed army - as a result they shouldn't get it