I was unable to find this on the paizo boards, but came across it on the Min/Max ones.
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The basic concept? A Sensei Monk of the Healing Hand 20 can cause allies to explode into oblivion on your death.
World changing twist? Make sure that friend had the name of a deity that you didn't like, and... *poof* name erased from everything. No more name means no more worshippers, which means no more power.
Great choice for targets? Replaceable buddies, like animal companions or bought animals (toads, rats, etc.).
True Sacrifice (Su): At 20th level, in a final selfless act, a monk of the healing hand can draw in his entire ki, which then explodes outward in a 50-foot-radius emanation. All dead allies within the emanation are brought back to life, as if they were the subject of a true resurrection spell with a caster level equal to the monk’s level. When the monk does this, he is truly and utterly destroyed. A monk destroyed in this way can never come back to life, not even by way of a wish or miracle spell or by the power of a deity. Furthermore, the monk’s name can never be spoken or written down again. All written mentions of his name become nothing more than a blank space.
Mystic Wisdom (Su): At 6th level, a sensei may use his advice ability when spending points from his ki pool to activate a class ability (using the normal actions required for each) in order to have that ability affect one ally within 30 feet rather than the sensei himself.
At 10th level, a sensei may affect all allies within 30 feet rather than himself (spending points from his ki pool only once, not once for each target). At 10th level, a sensei may instead spend 1 point from his ki pool (as a swift action) while using advice to provide a single ally within 30 feet with evasion, fast movement, high jump, purity of body, or slow fall.
At 14th level, a sensei may spend 2 points to grant one of the abilities listed above to all allies within 30 feet, or diamond body, diamond soul, or improved evasion to a single ally within 30 feet. These abilities function at the sensei’s level and last 1 round.
And the great thing is, no-one can ever complain about you doing it because the victim cannot be mentioned again!
It does not work on a deity the way you think for two reasons. First is it does not erase anyone with the same name as the monk. Just because you have the same name as someone else does not mean they are erased. If the monk has multiple names does it wipe them all out? If it does not then then the monk is nor really erased. If it does then the monk could simply go by every name and wipe out nearly everything. If someone calls the monk human then suddenly no one can say human and all records of the word human are gone. Just make sure the monk has been called by every race and profession and suddenly almost all communication is nearly impossible.
Secondly deities are not affected by this ability. Deities in pathfinder do not have stat blocks so cannot be affected by anything other than what the GM wants them to be affected by. Even if a deity has a stat block their power is not dependent on their worshipers. It was in third edition, but that was changed in Pathfinder.