I think some forgeworld models are seriously unbalanced because they are just too cheap for their points. An example is the Caestus Assault Rams I proxied in my last Apoc game. That 1 skimmer took about 20 meltas and a bunch of lascannons and battle cannon shots and only came out shaken. But more frightening are the 8 TH/SS terminators it dropped off (it can fit 10!), who proceeded to multi-charge and wreck a lot of tanks/units.
If the tomb stalker makes it to the new necron 'dex, you can be sure it'll probably be nerfed.
BTW, extrenm(54) is correct about the multi-assault. If you are a single model, you can only assault 1 unit. It's when you have multiple models in your squad can you multi-charge.
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