I did 2 tribes, one with each faction. The funny thing is...my magic tribe amassed 39,000 in food and my nature tribe ended up with 0. I had to grab everyone and have them go fishing to get my food replenished.

And even with level 3 of nature, my trees didn't replenish themselves.

I'm done with all the puzzles, have all my levels maxed out, so now I'm just growing the tribes.