Consolation Symbol Drop is a feature that rescues a disappointing 'dud' situation where a valuable special feature (e.g., a collector symbol appearing) is triggered, but ultimately results in no win due to the lack of other necessary symbols.
The core of this feature is to act as a 'consolation' prize, randomly triggering at the moment of peak player disappointment to artificially create the necessary symbols on the reels and guarantee a minimum win.