Procure: Riverworn Grotto
Syndicate Mission Suggested Level 9 - 23
The Syndicate has learned that there's a cache of valuable items at Riverworn Grotto. Go quickly and retrieve each Philosophers Stone before anyone else is aware.
Required Items
Rewards 
1,130 XP 
7.50 Coin 
250 Territory Standing 
540 Faction Reputation 
665 Faction Tokens Only available in Everfall
Prerequisites Requires Level 9-23
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I found many but it stopped counting after 4, might be bugged.
UPDATE: Spawn location in 2 places. Apparently, there is a chance you might now find one.