For each Level of Expiatio:
Decreases fixed cast time by 0.1 second.

When equipped with Archbishop Stone(Garment):
Increases magical damage against enemies of every race, except Players, by 15%.

When equipped with Archbishop Stone II(Garment):
Increases damage of Adoramus by 15%.

[iRO Description]
For every level of Expiatio learned, reduces fixed casting time by 0.1 seconds.
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Set Bonus
Archbishop Stone (Lower)
Archbishop Stone (Garment)

Increases magical damage against all race monsters (except players) by 15%.
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Set Bonus
Archbishop Stone (Lower)
Archbishop Stone II (Garment)

Increases all property magical damage by 15%.