You gain Advanced Melee Weapon Proficiency as a bonus feat. At 6th level you also gain Specialization as a bonus feat.
Source
Source
Against the Aeon Throne: The Rune Drive Gambit pg. 53
You gain one of the following feats as a bonus feat, provided you meet all the prerequisites of the chosen feat: Advanced Melee Weapon Proficiency, Improved Unarmed Strike, or Longarm Proficiency. If you already have all the listed feats, you can choose a bonus combat feat instead. At 6th level, if you chose Improved Unarmed Strike at 4th level, you gain Improved Combat Maneuver. Otherwise, you gain the Weapon Specialization feat as a bonus feat for the same weapon type to which the bonus feat you gained at 4th level applies.
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ID
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