I figure I'll try posting this again. The game has glitched and will not drop the blue shadestalker armor tonic formula for me, but - frustratingly - it has allowed me to unlock all of the shadestalker armor tonics in spite of not having the base tonic unlocked. I have put in more than 100 into the green tonic to try and get it to drop and gotten nothing. I continue to look for any information on issues like this and have found none, so this may be unique. I hope someone can look into it, but that seems unlikely given everything else that is broken. I'm assuming that this season is just a loss for me.