Okay this is a fantastic concept and pun. Having the twig start in an ennemy homeland in very flavorful, and to be honest everything about this faction is a flavor win. 

The twig powers are all bonkers, so I see your ennemy being tempted to use them. As waritten however, I believe in birdsong you could chosse X=50, draw 50 cards and stay at 0VP because you can't go in the negatives. I assume this is not intentional ? Can you use all 3 twig abilities during daylight ? It might be a bit broken for let's say woodland alliance to be able to recruit 4 guys in one action.

If you are the player with the least VP, do you keep the twig ? If that's the case I think you want to be sandbagging and intentionaly stay behind on points in the early turns until you are maxed out one warriors. You could also prevent yourself from discarding each turn to end up with more than 10 cards in hand and a myriad of action.

Devoured warriors filling the track is a really good concept, even if the price of detroying an altar might be a bit too harsh.

Overall, I love it :)

I think this One Twig will rule them all!  Great flavour in this faction.  I think it's kinda funny that the Twig Wraiths can't hold onto the Twig for more than a turn, where they give it to the person in last place.  Hopefully it can act as a bit of a catch up mechanism.  When another faction has the twig, can they do any of the actions, or just Branch Intelligence (since it triggers in Daylight)?

Do the numbers on the influence track mean anything?  Or are they just there to denote the order of the spaces?  You could move the Altars box above the Dreams box and make the Influence track vertical down the right side of the board.  Not sure if there's enough room for it to fit, but it might help the visual clarity (especially from the far side of the map...as a player across the table, I can literally see the Influence growing...).