Room boosting gives you the ability to boost different aspects of the game. While in your keep, drag & drop your Nobles into rooms. Depending on the room, you get the relevant boost.

This way you can boost your Constructions speed, Research speed, City defense, Silver production and more! Tap on a room's title to see more details including what is being boosted.

You can have up to two Nobles from your own family boosting up each room and up to one Noble from another family helping. Certain Noble roles and traits can affect the power of a boost in certain rooms.