Actually, you can do it all at the same time, if you're quick enough. I've put the root on one table and the stingers on the other. If you're doing it yourself, that's easy. If the alchemist is doing it, having someone by each table ready to put the stuff on helps.
Also, the alchemist is the only one who can fix that lever. As noted above, he doesn't appear in the game until Nheero tells you what to do to make the modified potion.
Nightowl2
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