Chroma's swarms are what I was thinking, and I happen to know an aquatic mammal that makes some great proxies for anyone interested.

I agree with Chroma that the Pylon makes the most sense. It is completely immobile which fits with a tomb world list (static defense).

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author of Syncing Forward and other stories...

It's a dog-eat-dog world, and I've got my Milkbone underwear on.

Well, it's still an extremely deadly formation... and in the Tomb World list can start on overwatch.

Again, it's a completely experimental list and hasn't had any data preseented; points and formations could certainly see change.