Back before
40K was officially cinematic again, I had
a discussion with
Big Jim - who's just posted
the latest update to Killzone, for sixth edition - on the subject of a kind of automatic GM to get more unusual events into games without needing an extra person.
I posted
the first three cards for a deck to do this, but for wargaming in general rather than just 40K, possibly also tactical roleplaying. The idea is that the cards interact with and modify various game elements, to set up chains of events. With the first trio -
Spill, Spark and Plume - flammability could be added to the table and elements set smoking.
Below are four more - Flaw, Gust, Lapse and Agent - adding new interactions involving smoke, as well as disorientation and the possibility a unit can be seen as compromised.
A general approach to using them is given in
the original post. Now there are more, it's worth mentioning the deck can be modified to suggest certain situations, by removing cards or using multiples. For example, more Gusts or Sparks could suggest a storm.