Ascetic Hunter( Complete Adventurer, p. 105)
You have gone beyond the bounds of your monastic training to incorporate new modes of bringing the unlawful to justice. Although many of your fellow monks frown on your methods, none can doubt that your diverse training has added to your ability to strike precisely and bring down your foes quickly.
Improved Unarmed Strike (PH) , favored enemy,
When you use an unarmed strike to deliver a stunning attack against a favored enemy, you can add one-half your favored enemy bonus on damage rolls to the DC of your stunning attempt. If you have levels in ranger and monk, those levels stack for the purpose of determining your unarmed strike damage. For example, a human 7th-level ranger/1stlevel monk would deal 1d10 points of damage with her unarmed strike. In addition, you can multiclass freely between the monk and ranger classes. You must still remain lawful in order to retain your monk abilities and take monk levels. You still face the normal XP penalties for having multiple classes more than one level apart.