Centered

Uncentered

 * wearing armor other than robes
 * equipping a shield
 * becoming heavily encumbered
 * using weapons other than the kamas, quarterstaves, unarmed and shurikens

Uncentered monks can Not perform the following abilities:


 * Fast Movement
 * Slow Fall
 * stances

Furthermore, a monk's ki will rapidly drop to zero.

An uncentered monk KEEPS the following abilities:

And +1 ac bonus at levels 2,5,10,15 and 20.
 * Armor Class Bonus: Passive bonus to Armor Class equal to their Wisdom modifier, if their Wisdom modifier is positive and not wearing armor, not using a shield and not encumbered).

Centered

 * only wearing robes
 * any gear such as jewelery, headpieces, gloves, boot, etc.
 * only using kamas, quarterstaves, unarmed and shurikens