Paralyzing Fists

Improved Unarmed Strike (PH) , Stunning Fist (PH) , WIS 15,

When two or more of your Stunning Fist attacks succeed in stunning a single foe in the same round, that creature must make another Fortitude saving throw (DC 10 + 1/2 your character level + your Wis modifier +1 for each successful Stunning Fist attack). On a failure, that creature is paralyzed for 1d2 rounds instead of being stunned for 1 round. Creatures that are not subject to extra damage from critical hits and creatures that are immune to stunning cannot be paralyzed in this manner.

When two or more of your Stunning Fist attacks succeed in stunning a single foe in the same round, that creature must make another Fortitude saving throw (DC 10 + 1/2 your character level + your Wis modifier +1 for each successful Stunning Fist attack). On a failure, that creature is paralyzed for 1d2 rounds instead of being stunned for 1 round. Creatures that are not subject to extra damage from critical hits and creatures that are immune to stunning cannot be paralyzed in this manner.

You can make multiple unarmed attacks to paralyze an opponent in a single round