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I ran into him today actually. The only one worth buying is the scroll of life to me. As for potions you can get the 6 elixir which is really nice! but it's a little pricy. And the loot is horrible lol. Usually I just sell loot to him. The expensive loot.
how much time does the scroll last?
It is realllyy hard getting a mount you want with the temptation of the potion peddler.