Does Sett Kingpin's effect that references 'buffed friendly unit at my battlefield' refer to the specific battlefield where Sett is located, or all battlefields controlled by the player?

Ruling: "At my battlefield" means the specific battlefield where Sett is located (equivalent to "here"). Sett only gets the bonus when he is at a battlefield, not while in base.

Nuances:

• When units talk in first person, it refers to "this card" not the player
• Sett does not get the bonus while in base, even if there are buffed units in base