Note If you use an Outer Rift exploit and in doing so reduce your arcane reservoir to 0, you immediately gain the stain of one manifestation from the accursed, demonic, hellbound, or possessed corruption. The GM chooses which corruption, manifestation, and stain you receive; this stain persists for 24 hours. Reducing your arcane reservoir to 0 in this way multiple times within a 24-hour period results in a new stain for each such instance, and each time you do so you reset the timer for all stains gained in this manner to 24 hours. At the GM’s option, multiple instances of abusing exploits in this manner could result in a permanent corruption, but otherwise these corruptions are temporary and do not progress. You can never gain a gift from a corruption in this way.
Unless otherwise noted, the saving throw DC for an arcanist’s exploit equals 10 + 1/2 the arcanist’s class level + the arcanist’s Charisma modifier.
Effect The arcanist can spend 1 point from his arcane reservoir to pull fiendish essence from the Outer Rifts into his own shadow. Malformed and nearly amorphous, the shadow-things swarm across his body, turning his eyes completely black and distorting his physical form. These shadows persist for 1 round per 2 arcanist levels (minimum of 1 round) and grant the arcanist a +2 deflection bonus to his Armor Class.
Whenever a creature provokes an attack of opportunity from the arcanist, he may make the attack of opportunity with his shadow, striking as a touch attack that deals a number of points of cold damage equal to 1d6 + the arcanist’s Charisma modifier plus 1 point of Strength damage. A successful Fortitude saving throw negates the Strength damage. This ability does not itself increase the number of attacks of opportunity the arcanist can make in a round, but feats like Combat Reflexes do allow him to make multiple attacks of opportunity with his shadow. The shadows cannot be compelled to make normal attacks—they lash out in this way only as a reaction to being provoked.