This is a known bug - searching the bug "short"list (stickied) will give you:
Quote:
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# I 168 Shroud of the Battle Saint The blessing from Shroud of the Battle Saint is removed when the unit wearing it casts Iron Will or Ironskin if the unit is not natively sacred. This bug does not affect natively sacred units wearing the shroud or sacred units that have been blessed with the Blessing spell. Discussion thread here
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