General | Combat Stamina
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Giant Killer (Combat) Source Advanced Race Guide pg. 18 Your cleaving strokes menace giants and larger foes. Prerequisites: Str 13, Cleave, Goblin Cleaver, Orc Hewer, Power Attack, Strike Back, base attack bonus +11, dwarf. Benefit: This functions as Goblin Cleaver, but your additional attacks can be made against creatures one size category larger than you or smaller. In addition, any such attacks made against humanoids (giant) gain a +2 circumstance bonus on attack rolls. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 120 As long as you have at least 1 stamina point in your stamina pool, the bonus on Cleave attacks made against humanoids with the giant subtype increases to +4.

Giant Killer (Combat)

Source Advanced Race Guide pg. 18
Your cleaving strokes menace giants and larger foes.

Prerequisites: Str 13, Cleave, Goblin Cleaver, Orc Hewer, Power Attack, Strike Back, base attack bonus +11, dwarf.

Benefit: This functions as Goblin Cleaver, but your additional attacks can be made against creatures one size category larger than you or smaller. In addition, any such attacks made against humanoids (giant) gain a +2 circumstance bonus on attack rolls.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 120
As long as you have at least 1 stamina point in your stamina pool, the bonus on Cleave attacks made against humanoids with the giant subtype increases to +4.

Archives of Nethys

Giant Killer (Combat)

Combat Trick (from the Combat Stamina feat)