New units. Their discussion and selection of upgrades.

Level 1: At the beginning, I take Dryads because Ents aren't available yet, and you can summon Bee Swarms. Then, with a full army of Nymphs. Level 2: Definitely Wind Dancers; they have a cool ability. Level 3: I prefer Archers. Stopping Shot and Double Shot (if successful, it's really good) are more useful, in my opinion. Level 4: High Druids have powerful spells. Level 5: I agree that if it's a mage, choose Light; if it's a warrior, choose Combat. Level 6: I take Wildlings. I don't know how to justify it. Level 7: Emeralds, because sometimes breathing on 2 cells is more useful. That's my opinion.