Arcane Weapon (Su)
Source: Advanced Class Guide, p. 9
As a standard action, the arcanist can expend 1 point from her arcane reservoir to enhance her weapon. The weapon is treated as magic for the purpose of overcoming damage reduction. At 5th level, the weapon gains a +1 enhancement bonus, which increases by 1 for every 4 levels beyond 5th (to a maximum of +4 at 17th level). These bonuses stack with any existing bonuses the weapon might have, to a maximum of +5. An arcanist can also use this exploit to add one of the following weapon special abilities: dancing, defending, distance, flaming, flaming burst, frost, icy burst, keen, shock, shocking burst, speed, spell storing, or throwing. Adding any of these special abilities consumes an amount of enhancement bonus equal to the ability’s base price modifier. Duplicate special abilities do not stack. If the weapon is not magical, at least a +1 enhancement bonus must be added to it before any weapon special abilities can be added. The benefits are decided upon when the exploit is used, and they cannot be changed unless the exploit is used again. These benefits apply only to a weapon wielded by the arcanist; if another creature attempts to wield the weapon, it loses these benefits, though they resume if the arcanist regains possession of the weapon. The arcanist cannot have more than one use of this ability active at a time. This effect lasts for a number of minutes equal to the arcanist’s Charisma modifier (minimum 1).
Bloodline Development: The arcanist selects one sorcerer bloodline upon taking this exploit. The arcanist gains that bloodline’s 1st-level bloodline power as though she were a 1st-level sorcerer. The arcanist must select an ordinary bloodline with this ability, not one altered by an archetype. As a swift action, the arcanist can expend 1 point from her arcane reservoir to bolster her latent nature, allowing her to treat her arcanist level as her sorcerer level for the purpose of using this ability, which lasts for a number of rounds equal to her Charisma modifier (minimum 1). She does not gain any other abilities when using this exploit in this way, such as bloodline arcana or bloodline powers gained at 3rd level or higher. If this ability is used to gain an arcane bond and a bonded item is selected, the arcanist can use that item only to cast spells that a sorcerer of that level could cast (limiting her to 1st-level spells unless she spends a point from her arcane reservoir).
If the arcanist already has a bloodline (or gains one later), taking this exploit instead allows her arcanist levels to stack with the levels of the class that granted her access to the bloodline when determining the powers and abilities of her bloodline.