Umm... wouldn't a blighted claw require blighted resources?
4 Blighted bricks
3 blighted Gem 1
3 blighted Gem 2
3 blighted gem 3
3 blighted bars
Dont remember the numbers on claws but you get the idea no? What would it require then?
Blighted resources only appear near an anchor. This depends on two things:
1. the thing is left alive long enough to blight the resources.
2. it's near the resources you want. So far, I've only seen the anchor spawn at two or three places. Meaning only two or three types of blighted resources- gold, jade and topaz.
Unless you enjoy killing hundreds of Ageis for one or two resources a piece...
I might be bugged on the core issue because I've never gotten same cores to stack.