Alter Damage
From Wookieepedia, the Star Wars wiki.
Alter Damage was a Force power used by some Jedi during lightsaber combat. With this power, Jedi were able to reduce the damage inflicted by their lightsaber so that it did not deal lethal damage. The Jedi had to first sense how much life energy, or strength, their opponent had and then had to use the Force to reduce the damage the weapon inflicted so that a murderous wound could be reduced to one that was less likely to severely damage. Jedi were known to use this power to simply incapacitate their opponents rather than kill them. This power was only possible to use when a Jedi was wielding a lightsaber, as it was the weapon in which they would most strongly identify.
