Patch 5.4.0 (10-Sep-2013) Nightfall now gives Corruption a 10% increased chance to generate a Soul Shard on the most recently applied Corruption.
Patch 1.3.0 (07-Mar-2005): Fixed a bug where the Shadow Trance effect was lost without benefit. Previously, the talent had a 3%/4% chance of triggering. It now has a 2%/4% chance of triggering, and the tooltips have been updated to accurately reflect this change. The Shadow Trance buff granted by the Nightfall talent will no longer be used up by a shadowbolt that was in mid-cast.