Invasions expands Planetfall with a new Playable faction complete with its own campaign, a minor NPC faction, and a handful of new features. The Shakarn are a race of lizards playing off of the conspiracy trope of secret lizard people hidden within society.
When I reviewed Age of Wonders: Planetfall. It turned out to be one of my favorite games of the year. Revelations is a content expansion that adds a brand new secret tech, NPC faction, mini-campaign, and some juicy new game mechanics.
Age Of Wonders: Planetfall shocked me with its depth. It is pretty easy to learn but its strategical roots run deep. It is a rabbit hole you can easily get lost in as hours vanish when they felt like mere minutes.