Enter the Bronze Age with the new expansion for Rise of Tribes. It's called Beasts and Bronze and as the name suggests, you can now gain bronze resources as you play. There's also, as the name also implies, more beasts to encounter during the game. This new set is up on Kickstarter now.
From the campaign:
Beasts and Bronze and The Vul’Keth Invasion (solo mode) expand the original Rise of Tribes game. The original with deluxe pieces is now the Mammoth Edition!
Not only does Beasts & Bronze and The Vul’Keth Invasion all fit in the box, but they also come with a nifty tray that fits the entire Deluxe Upgrade bits inside THAT. It’s Box-ception! … a little known early ancient technology, perfected for this campaign.
The campaign's more than 5x funded with 18 days left to go.