1st - Studied The Blade - Add your ranks in Knowledge: Arcana to Will saves against artifacts. You are also proficient with any intelligent item.
4th - Knowledge Is Power - you can change your casting stat or any one class feature to run off your INT mod instead of its original modifier; if you do not have a class feature that works with this power, you can choose either WIS- or CHA-based skills to run off your INT mod instead.
7th - Arcane channel - If you hit with an attack roll from a magically enhanced weapon, you can expend one use of power to add an additional 2d4 + INT mod force damage. Your power uses are equal to your ranks in Knowledge: Arcana.
10th - Living Alfier - When wielding an Alfier, you can join with the weapon mentally, two minds becoming one. You can enter this state for 1 minute per day safely; every round after that, you must make an Ego check to keep the Alfier from gaining full control. While in the Living Alfier state you gain the following benefits:
You can not roll lower than a 5 on attack rolls, anything lower is considered a 5.
You gain access to one combat or metamagic feat you qualify for but do not possess.
The crit modifier on all attacks increases by 1, to a maximum of x4. This increases the critical modifier on spells to a maximum of x3.
You gain temporary hit points equal to the Ego of the Alfier plus your intelligence score.
You share any special senses that the Alfier may have.