Taking the Narrative by the Tail: GM Intrusions & Special Effects (2014)

From publisher blurb:

Great moments don't just happen on their own.

GM intrusions offer an opportunity for the Numenera GM to really shine--and for the players to experience incredible turning points in their characters' stories.

But how do you use this feature of the game to its fullest? Taking the Narrative by the Tail offers tips and techniques for great GM intrusions, as well as a sampling of ready-made GM intrusions for various scenarios at the table. Additionally, readers will find suggestions for major and minor effects--perfect for those moments when you roll a natural 20 and want your character to do something that no one will forget.