You can cause your victims to appear dead while actually remaining alive.
Prerequisite(s): Int 13, true death class feature
Benefit: When you successfully make a death attack against a creature and choose to paralyze it, the creature remains helpless for a number of hours equal to your assassin level. During this time, they appear dead and cannot take any actions, though they are still able to perceive their immediate surroundings. A creature that studies the victim for a full minute and makes a successful Perception check (DC 20 + your assassin level + your Intelligence modifier) is able to determine that the victim is paralyzed but not dead.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.