From Pathfinder #177: Burning Tundra, which isn't enabled.

Mammoth Charge

FEAT 6

Activity 2 actions

Requirements You are riding your megafauna companion.

You Command an Animal to order your megafauna companion to Stride twice. At any point during this movement, you can make a melee Strike against one enemy within reach.

Pathfinder #177: Burning TundraOGL