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The army I am working with at 500 pts is:

1x Prime, dual boneswords, adrenal glands, toxin sacs
1x Carnifex, dual scything talons

11x devilgants
12x Hormagaunts, adrenal glands, toxin sacs]]> http://www.dakkadakka.com/dakkaforum/posts/preList/493892/5063913.page http://www.dakkadakka.com/dakkaforum/posts/preList/493892/5063913.page GMT
I would imagine a list would look something like...

Overlord MSS, Warscythe

2x Warrior/immortal units in nightscythes,

with the balance spent on crypteks.

As for your own force...

It is totally possible to have 2 tervigons in 500 points, 1 will be the HQ, and 1 will be a troops choice, with the balance spent on termagants, or you could mix it up a little and just have 1 Tervigon, and a wider selection of units such as Hive guard, possibly some warriors and so forth. but with the limited number of points, 2 MC's will be a nightmare to kill, and since the tervigons can spam new units, holding objectives against the cronair will be incredibly simple]]> http://www.dakkadakka.com/dakkaforum/posts/preList/493892/5063964.page http://www.dakkadakka.com/dakkaforum/posts/preList/493892/5063964.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/493892/5064781.page http://www.dakkadakka.com/dakkaforum/posts/preList/493892/5064781.page GMT