I think the combination of the last two, along with who knows what else, is most likely the culprit, mixed with charms to delay onset of symptoms and obfuscate the poison used.

• 我认为混合剂成分包括后两种，天晓得还有什么东西在里面，投毒者很可能利用魔法延迟了魔药投用后出现症状的时间。