Bring Darkness: When you roll a natural 20 on a melee or ranged attack, you envelop the target in shadow, applying the Darkness debuff. If you have the feat First Blood, the trigger of First Blood now also applies the Darkness debuff, and First Blood now triggers on Harmful Spellcasts. Darkness: The target is no longer immune to Sneak Attacks. -3 Spell Resistance, -3 Physical Resistance Rating and -3 Magical Resistance Rating per stack. Lasts 12 seconds, stacks drop 1 at a time. Max 3 stacks.Watch out for this one, as spells & abilities with both harmful & beneficial portions (tested using reborn in fire & spring to summer, am assuming it'll apply to other similar things) will cause first blood to proc on yourself & party members dealing bane damage... and this bane damage appears to scale with spellpower, presumably of the spell it's "riding" that causes it to proc.. I ended up hitting myself for 1400+ bane damage, which was a nasty surprise.First Blood. Description: Melee weapons and unarmed attacks deal 50-300 extra untyped damage against enemies with 90% or more HP. This extra damage won't trigger twice within three seconds..