“Action” is a type of triggered ability. Players are permitted to trigger action abilities during their turn or by request during other players’ turns.
- Players can trigger abilities on encounter cards.
- Players can only trigger action abilities on cards they control.
- Players cannot trigger abilities on obligations in other players’ play areas.
“Forced Action” must be resolved before the player phase can end.
- A forced action ability can be triggered at any time a non-forced action ability could be triggered.
- If the forced action ability had a cost that cannot be paid or requires one or more valid targets and has none, the phase can end without the ability being resolved.
Ref. Action (p.6, Rules v.1.7)