"An alarm," Rex replied. "If something dangerous actually enters the clearing, press the button and you'll make enough noise to wake even the deepest of sleepers, so only use it in the most dire of emergencies." He sighed. "I wish I had thought to bring one of my other projects with me, but I wasn't expecting I'd need to set up proximity wards when we set off." He shook his head. "I know the runes to make them, and there's plenty of wood around here. Maybe I can carve some tomorrow and have Page enchant them when we have some time to rest again." 