Template:Farming:zaven the alchemist

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From the Quest Selection screen take Act II quest No. 6. Betrayer of the Horadrim.
Take the Waypoint in the Hidden Camp to the Path to the Oasis. You'll get a Checkpoint as soon as you materialise.
Go down the Path to the Oasis and into the Dahlgur Oasis
Go right hugging the edge of the map and take the first right. This is a small cul-de-sac with a waterfall and could be where Zaven appears. If not go straight back out and head north.
Hug the right edge of the map and eventually you will come to another identical cul-de-sac. This is the second location Zaven could be. He could be in neither.
If he is not, leave the game and Resume Game to appear back at the Path to the Oasis.

Special Notes:

You might consider only looking for the first spot he can appear in as that is so close to the Waypoint in the Path to the Oasis so it is very quick to see he isn't there and restart. You can see by the Dahlgur Oasis map that the spot further north is quite a trek and you'll be pestered by beasties on the way up too.
When you've found and saved Zaven the Mysterious Cave will open behind him and this is where you find the Liquid Rainbow, one of the ingredients needed for the Staff of Herding.