From The Dim Future Wiki
An instantaneous effect is an effect that occurs without going on the stack.
There are several built into the game:
- If a character ever has endurance less-than or equal to 0, it is placed on the discard pile as an instantaneous effect
- If a leader ever has endurance less-than or equal to 0, its controlling player losses the game as an instantaneous effect. All cards owned by that player are removed from the game and any characters on areas removed this way are are moved to the nearest remaining area.