Refers to additional orb matches beyond those that were manually matched, generated from the new orbs that appear from above (can also be called “skillfall”). No skyfall leaders
and the 
No Skyfall Badge will disable this from occurring.
Skyfall combos are often a double-edged sword; they can help you in increasing damage output or overcoming combo shields, but the extra damage can also ruin potential damage control on spawns (specifically spawns with 
, such as Sopdet
).