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Entries marked with a * are not formations.

Tendril of the Devourer Detatchment
Composition:
Choose 1-3:
Invasion swarm
Support Swarm
Vanguard Assault Swarm
For each swarm:
0-1 Synaptic Conduit
0-12 Auxiliary Organisms

Tendril of the Devourer special rules:
Fear
Move Through Cover
Hunger unending: all models from this Detachment that have at least 1 melee biomorph may run and assault in the same turn.
Will of the Hive Mind: If this is your primary detachment, units in this Detachment with the Synapse Creature special rule gain Eternal warrior while in synapse range of your Warlord.
Aeons of life: If selected from this detachment, your Warlord may re-roll the result of the warlord table, but may only do so on the Tyranid Warlord Table.

Invasion Swarm:
0-1 Tyranid Prime
1 Brood of Warriors or Shrikes
Must choose at least one of:
1-3 broods of termagants
1-3 broods of hormagaunts
1-3 broods of gargoyles
Broods get +1 to their roll on the instinctive behavior table, broods gain objective Secured, intervening cover saves generated by units in this formation gain +1 to their cover saves.

Vanguard assault Swarm
0-1 deathleaper
1-3 lictor broods
1-3 genestealers broods
Objective secured, may assault from Infiltrate/outflank at -2" penalty, lictors/broodlords/deathleaper have precision strikes, all units have 5++ Invulnerable in the assault phase.

Support Swarm
0-1 malanthrope broods
1-3 venomthrope broods
1-3 zoanthrope broods
0-1 toxicrine
0-1 Maleceptor
Spore field gains 3", venomthropes/toxicrene gain rending, synapse gains 3", re-roll 1's in psychic phase

Synaptic Conduit
1 Swarm Leader organism (Hive tyrant [may be swarmlord], Tyranid prime, Trygon prime, Old One Eye, Deathleaper
0-1 tyrant guard (if tyrant)
0-1 tervigon
0-3 zoanthrope broods
0-3 warrior broods
Gains 6" of synapse (if synapse), adamantium will.

Auxiliary Organisms

Skyswarm broods
1-3 broods of gargoyles
0-3 skyslashers
0-3 shrikes broods
0-1 Hive tyrant (must take wings)
0-1 Harpy
0-1 Hive crone
Gargoyles gain obsec, return on 4+ like in skyblight, shrikes gain obsec, models may assault zooming fliers even if swooping, but only while swooping.

Wrecker node
0-1 old one eye
3 broods of carnifex (may be stonecrushers)
0-1 haruspex
1-3 broods of warriors
rage, units may not take bio cannons

Bio-blast node
3 broods of carnifex
0-1 exocrine
1-3 broods of warriors
If possible, broods must take a bio-cannon
re-roll 1's to wound/pen while shooting if in synapse of a warrior brood from this formation, split fire

Tunneling swarm
1-3 broods of ravenors
1 mawloc
1 Trygon
0-3 broods of rippers (must choose deepstrike)
0-1 trygon prime
one roll for whole formation from reserves, may assault out of deepstrike at -2" penalty

Endless swarm
1-3 broods of termagants
1-3 broods of hormagaunts
1-3 broods of warriors
obsec, gaunts come back on 4+

Progenetor node*
1 tervigon
1-3 broods of gaunts (one must number 30)
obsec, ignore first doubles roll, instead spawn and lose a wound no saves, spawned gaunts gain obsec

Sky fall assault*
Choose 1:
1-3 tyrannocytes
1-3 sporocysts
Spore mines and Mucolid Spore clusters may assault after being spawned, you may begin rolling for reserves for tyrannocytes on turn 1.

Spore field
3 broods of mucoloids
3 broods of Spore mines
0-3 meiotic Spore sacs
Infiltrate, come back on 4+

Living artillery node
1 exocrine
1 brood of biovores
1-3 broods of warriors
If within synapse range of a unit of warriors from this formation you may rerolls the scatter dice, pinning

Biomass Collection Broods
1 haruspex
1-3 ripper swarms
1-3 pyrovores
Outflank, cause a ld penalty within 12" of a unit equal to the turn number -2.

Swarm Guardians*
Choose 1:
1-3 Tyrant guard
1-3 Hive guard
preferred enemy, precision strikes/shots

Biological Supremacy*
Choose 1:
Harridan
Barbed Hierodule
Scythed Hierodule
Hierophant
Tyrannofex
Dimachaeron
Monster Hunter, tank hunter, It will not die

Those are my ideas. Thoughts?]]> http://www.dakkadakka.com/dakkaforum/posts/preList/661648/8080335.page http://www.dakkadakka.com/dakkaforum/posts/preList/661648/8080335.page GMT
I don't think it fixes the majority of issues with the nids' - those issues being mobility, tank hunting options, and costs. If these are addressed with the codex, then it is definitely a strong formation with good balance.

]]> http://www.dakkadakka.com/dakkaforum/posts/preList/661648/8081301.page http://www.dakkadakka.com/dakkaforum/posts/preList/661648/8081301.page GMT
While I agree that nids right now are slow (I did say that I wasn't going to change the codex in this post), and almost ALL ground troops I believe should be beasts, I tried to keep the codex the same with adding special rules to improve the base speed.

Rules like Hunger unending: move hormagaunts 6", run them up to 9", assault up to 12" in the same turn.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/661648/8081507.page http://www.dakkadakka.com/dakkaforum/posts/preList/661648/8081507.page GMT