"The ZGD showed me an enchantment that could be placed on bodily fluids, most often saliva, which would boost the strength of that link. So, if you were in unfamiliar territory, you could leave a trail of spit for yourself, sort of like Hansel and Gretel’s breadcrumbs, and find your route back to safety. If you had time to prepare for a mission, faeces was most often used, as it lasts longer. Luckily, I never had to do that!"