Source: Champions of Valor
You understand the strengths and weaknesses of the Shadow Weave and are more resistant to its tricks.
Prerequisite: Knowledge (arcana) 5 ranks, Spellcraft 5 ranks, spellcaster who uses the Weave.
Benefit: You get a +5 bonus on caster level checks to detect, counterspell, and dispel Shadow Weave effects.
You get a +1 bonus on Will saving throws against Shadow Weave effects.