Cara was the one who came up with the solution.
They would borrow Dana from the hammock, and move her into the Dana Space, where they could be alone. With everyone else sleeping, they could wake her up just enough to get her to drink the potion, and then wake up Karl to give him the good news once the whole process was completed and the evidence of their methodology was hidden.
The first part of the plan went off without a hitch.
The Dana Mage was extracted from bed, moved to her bed in the Dana space, and then gently shaken awake by Remi, who presented her with the potion.
"It's a health tonic. Try it and tell me how it tastes." The Naga insisted.
That was far from the strangest request that Dana had been woken up for, so she simply downed the potion, then tilted her head and pursed her lips, trying to understand the flavour.
That was where it all went wrong.