DISCLAIMER: Your Steps and Tasks may be different
1) Speak with Caraustam at loc=23596,15869 Roman Aqueducts
2) Kill Plutonian alchemists, loc=22699,29620 Roman Aqueducts, until you find a Plutonian Alchemist Tailsman.
3) Take the Plutonian Alchemist Tailsman back to Caraustam and hand it to him for your reward.
lvl 18 received 285,000 experience and 13 silver.
Dialog from quest:
Speak with Caraustam at loc=23596,15869,16434 dir=156 Roman Aqueducts
Caraustam says, "Greetings to you (your class). I am Caraustam, a Friar from Prydwen. I was sent down here to [monitor] things."
Caraustam says, "Oh aye. I was sent by the Church to monitor the fighting down here. It's very interesting, these Plutonians. They are very fanatical in their worship of their god. I think I have found something that helps to give them their [power]."
Caraustam says, "I have noticed a small trinket on the Plutonian Alchemists. They wear it around their necks. I believe it is a talisman of sorts, but have not as of yet been able to get one for myself to test my theory. Do you think you could [get] me a talisman?"
Will you help Caraustam obtain one of these tailsman? [Levels 18-21]
You have been given the Caraustam's Need quest.
Caraustam says, "Excellent (your class). Now I don't know if all of them wear these talismans all the time, so you might have to do some searching to find a plutonian alchemist that is wearing one. Come back to me when you have found one."
[Step #1] Venture forth into the Aqueducts and find a plutonian alchemist. Remember, not all of them carry the tailsmans, so you may have to hunt a few down to get one.
[Step #2] Return to Caraustam in the Aqueducts with the Plutonian Alchemist Tailsman.
Caraustam says, "Welcome back (your class). Did you manage to get a talisman?"
Caraustam says, "Ah! You have had success where I had found only failure. Thank you (your name), for your help. Please take this for your services. Good luck to you."
You are awarded 285,000 experience!
You are awarded 13 silver and some copper!
You have completed the Caraustam's Need quest!