The wand is used, but it has no effect.

"I'm not going anywhere until we finish this day, because I'm not heading off alone, separated from the group," says Wren. "Now gather round. I'm seeing some changes in the stone down here."

And with that, he spends a few rounds to talk with the party about what he's noticed.
Spoiler: OOC
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He is redoing his Careful Teamwork, which increases allies Disable Device, Perception, and initiative.