When Heidi returned back from the town, she went up to her room and locked it before going through her trunk, rummaging through the clothes to find the bottle Duke Scathlok had given her. Taking it with her, she went to her bathroom. Though she had taken it, she had never meant to use it and if she wasn't going to use it there was no point in hiding it. With that thought in mind, she opened the cork of the bottle very carefully as she didn't how poisonous the liquid in it could be. She poured the liquid into the drain to see it melt the ground slightly around it before disappearing down out of sight. She stared for a few seconds before pouring water around to make sure no residue of the liquid was left behind.