"This is bad."
After having added Sorcery for the priest as well, Shard struggled to take out the little book. Using it required a price to pay, so Shard didn't dare to write anything too extreme. Instead, he dipped his finger in the blood he had spat out and wrote on the blank page:
"Even if primitive and evil forces cause me to fall into slumber, I will be able to awake at the appropriate time."
This was to prevent himself from also passing out, ensuring that there would still be someone to lead the others in escape. Using such a precious Relic in this way was certainly wasteful, but it was the safest phrase he dared write with the Keeper of Secrets Level Relic.
He could have written "Shard defeats the Evil God," but the cost of that might have sent him straight to Detective Sparrow.