The Krotan Klaw mobs are a great alternative place for you to grind in The Upper Abyss. Here you will find Krotan Klaw mobs that are levels 37 - 39. These are a great alternative grinding spot if you've exhausted the other ones or if they are over crowded. Also another good thing about being here is if your faction owns a nearby fort or Artifact then you will be able to fly there for safety if any Asmodians pop in.
For the Elyos you should be able to get a repeatable quest from Lyaeus for these Krotan Klaws. It will require you to collect 5 Krotan Klaw Legs and 5 Wings. Lyaeus can be found on the island just south of this one and the name of the quest is "Klaws for Panic".