Needs review
Source: Rokugan Campaign Setting

Description: You are capable of a deadly attack causing opponents to wither and die.

Prerequisites: Improved Unarmed Strike, Stunning Fist, Void Use, Depths of the Void, WIS 19, Pain Touch, 13th Level Monk or Inkyo

You may spend five Void Points when delivering an unarmed attack to deliver the Death Touch. The target must immediately make a Fortitude save (DC 10 + one half your level + your Wisdom Modifier) to resist the effects. If unsuccessful your target takes damage equal to your level once every twelve hours. This damage may not be healed by any means until the death touch is removed.

You may remove a Death Touch you have placed by making another unarmed strike against the same target. The only other cure is a Heal check (DC 50). If the healer also knows the Death Touch feat, he gains a +20 competence bonus to this roll.

Death Touch is ineffective against targets that are immune to critical hits.