Up to 15 drop pods, which contains a combination of Knightframes and Lancers, will be dropped throughout the duration of Knightfall. Coronian commanders have to be careful: if the Knightfall beacon is destroyed while reinforcements are being dropped, Knightfall will be halted abruptly.
However, Knightfall is the most expensive support power in the entire game (even beating epic unit costs, especially the Coronian Harbinger), so a Coronian commander should take caution when deploying its beacon in the midst of an enemy siege.
Knightfall is similar to GDI's Drop Pod support powers from Tiberian Sun and Tiberium Wars. The only exception is that Knightfall has a restriction in regards to where it can be deployed on the battlefield.