Your fey heritage augments the power of certain types of magic. Your caster level and save DCs for Enchantment spells and Warlock Invocations increase by 1. Use: Automatic This feat is worded ambiguously, so it could be interpreted as "Enchantment spells and all Warlock Invocations" or "Enchantment spells and Enchantment Warlock Invocations". The latter interpretation appers to be the correct one, although probably not according to PnP rules; this feat only affects the DC of Invocations with an Enchantment effect (such as Charm). In the base game Charm is the only such Invocation.