You are knowledgeable about the secrets of the subterrainean world and are wise in its ways. Tier: Heroic Prerequisite: — Benefit: You gain a +2 bonus to all skill checks made in the underdark. Back to Main Page → 4e Homebrew → Character Options → Feats → General Feats. Back to Main Page → 4e Homebrew → Character Options → Feats → Heroic Feats. Back to Main Page → 4e Homebrew → Sourcebooks → Arachonomicon; the Book of Spiderkind → Feats.