So I've just picked up a nice Shelob model and decided it's about time I tried my hand at a nice Cirth Ungol themed force. So far I've got:

Warband 1
Shagrat
12 Mordor Uruk-hai
Warband 2
Gorbag
9 Orcs w/ shield or spear, 1 w/banner
3 Warg riders w/shield
Warband 3
Shelob

at 400pts (ish)
So thoughts and criticisms, (I really would like to keep Shelob in if possible) and also how should I expand from there to 600 or even 1000pts?

I like the theme, and it's got everything you want from a list. At higher points you could consider upgrading Shagrat to the war leader version, or adding in a ringwraith. It'd definitely need more numbers at higher points cost though, whether that's uruks or orcs

Okay cool, so more numbers in higher points games. Like the idea of adding a wraith in there and Warleader Shagrat is so cool

Poisonous and deadly..

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Conversation/Ideas over painting etc, can check here:
http://www.one-ring.co.uk/viewtopic.php?f=50&t=29455