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The most current rules are in Imperial Armour 4, page 71 for the Scythed and page 74 for the Barbed. They're perfectly legal in standard 40k games, though I tend to recommend keeping superheavies to around 1/4 of your points on principle so you should probably avoid using them below 2,000pts (the scythed is 535pts, barbed is 565pts) unless you're in a fairly competitive environment.
There are no formations that allow the use of them (there exist formations and detachments that permit multiple superheavies/Lords of War slots, but none available to the Tyranids, unfortunately), but you can just take two CADs to get two Lords of War slots.
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