He has Risen

An ancient being rises from its slumber. It chooses your town to act as its servants.

It will expect a sacrifice every 3 days.  Build an army and conquer your neighbours in order to satiate its needs.  Its expectations will rise rapidly, so you will have to hurry up with your conquest, or you yourself may end up being the sacrifice.

You can send your units to attack the locals. Simply click on the unit you want to control, click on a tile you want to move to or click on an adjacent tile containing an enemy or a town to attack it. Note that you cannot attack a town that is on the same tile as the attacking unit.