Alright folks this idea has been brewing in my head for quiet some time and I would love your help.
My group is gearing up to ascension and i had something sinister planned for the sector, A hive fleet emerging from the dark reaches. So with this in mind I was looking through some tyranid enemies and such and said to my self " Jeez sure I could take some ideas out of the tyranid codex to make new enemies..but what if there where tyranid species we haven't encountered yet."
So in the grand scheme of things of building one or 2 of my own I was hoping for you guys to help me out (get the creative juices flowing and what not) and i would love to hear your ideas, who know might help me with more cool stuff. Hope to hear from you guys soon.