Of course it's the heavy support weapon! -_-
But I bet that all monofilament weapons have the same special rule base.
The 'monofilament' thing will be the counts-in-difficult-terrain like in the 4th edition night spinner rules.
So when the shadow weaver doesn't have 'rending', death spinners won't have it either.
With the rending lite of the shuriken weapons I doubt another 'weapon family' will get rending oder rending-like rules.
But I still hope for my beloved monofilament weapons. *.*