Vow of Poverty

Prerequisite(s): Sacred Vow
Benefit: By taking this feat, you are taking on a large burden and assuming a difficult lifestyle. Even so, the benefits far outweigh the cost. You cannot own ANYTHING, this includes magic items. You can take this vow at any time, and you will gain the abilities of the ascetic lifestyle equivalent to your level (except the bonus feats, you must advance as an ascetic to gain these).
AC Bonus (Su): A 1st level ascetic receives a +4 exaulted bonus to his AC. This bonus increases to +5 at 3rd level and thereafter increases by +1 for every 3 levels attained. This bonus does not apply to touch attacks and does not hinder incorporeal touch attacks. Brilliant energy weapons cannot ignore the bonus however. This obviously does not stack with an armor bonus.
Bonus Exaulted Feats: At 1st level, an ascetic gets a bonus exaulted feat, and another at 2nd and every 2 levels thereafter. Unlike the other benefits of the Vow of Poverty, these feats are not gained retroactively.
Endure Elements (Ex): A 3rd level ascetic is immune to the effects of being in a hot or cold environment. He can exist comfortably in conditions ranging from -50 to 140 degrees fahrenheit without having to make a fortitude check.
Exaulted Strike (Su): At 4th level the ascetic gains a +1 enhancement bonus on all his attacks and damage rolls. In effect, any weapon he wields becomes a +1 magic weapon, and can overcome the DR of a creature as if it were a magic weapon. This enhancement bonus increases to +2 at 10th level, +3 at 14th level, +4 at 17th level and +5 at 20th level. At 10th level, any weapon damage the character deals is also considered to be good aligned, so it can bypass the DR of some evil outsiders.
Sustenance (Ex): A 5th level ascetic no longer needs to eat or drink.
Deflection (Su): A 6th level ascetic receives a +1 deflection bonus to his AC. This bonus increases to +2 at 12th level and +3 at 18th level.
Resistance (Ex): At 7th level, an ascetic gains a +1 resistance bonus on all saving throws. This bonus increases to +2 at 13th level and +3 at 17th level.
Ability Score Enhancement (Ex): At 7th level the ascetic gains a +2 bonus to one of his ability scores. At 11th level he gains another +2 to that score and an additional +2 to another score. At 15th level he gains +2 to both scores and an additional +2 to yet another score. At 19th level, he gains +2 to those three scores and +2 to a fourth ability score.
Natural Armor (Ex): At 8th level, the ascetic gains a +1 bonus to his natural armor. This increases by +1 again at 16th level.
Mind Shielding (Ex): At 8th level, an ascetic character becomes immune to detect thoughts, discern lies, and any attempt to discern his alignment.
Damage Reduction (Su): An ascetic gains DR 5/Magic at 10th level. At 15th level this improves to DR 5/Evil, and at 19th level DR 10/Evil.
Greater Sustenance (Ex): Once he attains 12th level, an ascetic no longer needs to breathe.
Energy Resistance (Ex): At 13th level, an ascetic gains energy resistance 5 to cold, acid, electrical, sonic and fire. This increases to 15 at 20th level.
Freedom of Movement (Ex): At 14th level the ascetic can act as if continually under the effect of a freedom of movement spell.
Regeneration (Ex): At 17th level, an ascetic heals 1 point of damage per level per hour rather than per day. This ability cannot be augmented by a Heal check. Nonlethal damage heals at a rate of 1 point every 5 minutes.
True Seeing (Su): At 18th level, an ascetic gains a continuous true seeing ability, as the spell.
A character who has forsaken material possessions may find himself at a marked disadvantage when it comes to certain necessary expenses, such as expensive material components. One option is for the ascetic charater to beg components from other party members, who are probably gaining as much benefit from having the spell cast as the caster is. Alternately, an ascetic spellcaster can sacrifice xPs in place of expensive components, with a cost of 1XP per 5GPs. Having a character in the party who has taken a vow of poverty does not mean that other party members get a bigger share of the treasure. An ascetic character must be as extreme in his works of charity as he is in self-denial. His share of the profits from an adventure or the sale of found items, must be donated to charities or used to help the needy. While taking on thwe burden of poverty himself, the ascetic realizes that many do not have that choice and have poverty thrust upon them. He actively seeks to help them in all ways possible.
Source: Book of Exalted Deeds