When can actions be played, and how do actions, reactions, chains, and priority work in Riftbound?

Ruling: Actions can be played during your turn when there is no chain or showdown, OR during showdowns when you have Focus. Units and gear use the chain but do not allow reactions to be played in response.

Sequence:

• Focus is permission to play an Action during a showdown; when you have Focus and the chain is empty, you can play an Action
• Priority is permission to add to an existing chain; you receive Priority when you add an item to the chain and between chain items resolving
• Priority always passes between all players when one player receives it
• During a showdown, the player who applied contested (moved to the battlefield) gets Focus first
• The showdown does not end until all players pass Focus without starting a chain

Nuances:

• Your opponent cannot play reactions in response to you playing a unit or gear
• The player who controls the next chain item gets Priority