The pill Lord Revelation had Meng Hao swallowso that Meng Hao doesn't trick them, while he was bring them into Patriarch Reliances mediation zone. It played a major role in the story as it planted a Resurrection Lilly inside Meng Hao which is virtually impossible to get ride of. It eventually led to sprouting a Five-Colored Resurrection Lilly in Meng Hao and being his Second Spirit Severing.