During showdowns, when the rules say you can do 'one of the following' (play a spell, activate an ability, invite, or pass), does that mean you can only do one thing total before passing focus, or can you play multiple spells/reactions before passing?

Ruling: You can do multiple things during your focus in a showdown. The list is just showing your options for what you can do.

Nuances:

• You only lose focus when you choose to invite or pass
• You can play multiple reactions and spells while maintaining focus
• The "one of the following" phrasing is describing available options, not limiting you to a single action