1. Herbal medicines from other worlds can be fine. The medical kits supplied will have scanners that double-check by scanning an individual, then the medicines, and give a yes or no indication. Basically, stick with digestible herbal, salves, etc. Nothing magical or energy-based.

2. I know nothing about Lazarus, but they won't be mindless zombies. They will be time-displaced NPCs, yes, that may have been dead for a few seconds before getting up again or just won't die, no matter how they're attacked.

3. I only know about Ryo's senses regarding gods, etc. Can you explain what you're looking for?