Node Spellcasting( Champions of Ruin, p. 25)
[General, Node Magic]
You have discovered the secret of the magic of a particular type of node.
Spellcaster Level 1,
You are attuned to one type of node and the magical power it provides. When you choose this feat, choose a type of node (earth, evil, or Shadow Weave). This feat grants you access to the various node magic feats and node powers, and allows you to make a Spellcraft check instead of an Intelligence check to notice nearby nodes of the type to which you are attuned.
You can gain this feat multiple times. Each time you take the feat, it attunes you to a different node type.
A creature without this feat cannot take other node-related feats, cannot access a node's full potential, and must make an Intelligence check to notice nearby nodes or to manipulate node powers.