If someone is wondering why Adrian didn't use 'Sacred blessing' against the undead, then the reason is because the buff provided would be light based which would cause his body to become detectable by the undead.
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Chapter 119
The plaza was cleared, and all the audience was in a circle, the silver knights keeping the bandits in check. In front of me stood a B- rank bandit. His weapon of choice was a blunt Warhammer. He was bulky like the typical bandits in the novels. Since he was an extra and about to die, I didn't bother observing his appearance.
But what I did know for sure was that he was nervous. After all, he was surrounded by the silver knights of the strongest force on the earth. Although I had said that they would gain their freedom if they managed to beat me, what if I took my words back in the middle of a crisis?