Aether Raids:
Place structures, a defensive team, and more on your maps,
and then attack or defend to increase your Lift.
If the defender is defeated within seven turns, the attacker wins.

どうやら7ターンの時間制限があるっぽいね
7ターン以内に全滅させれば侵攻側の勝ち、させられなければ防衛側の勝ちか