I've been putting together a cavalier/mammoth rider build with a focus on Overrun. I'm totally confused on who needs what feats for all this to work. This is not for pathfinder society. The character build is lvl 12 with 9 in Cavalier and 3 in Mammoth Rider
The character has taken Power Attack, Flagbearer, Mounted Combat, Trample, Ride-by-Attack, Spiked Destroyer, Mounted Onslaught, Spirited Charge.
The mount has taken Power Attack, Improved Overrun, Iron Will, Greater Overrun, and Charge Through.
If the mount initiates a charge and uses overrun, do Trample, Ride-by-Attack, Spiked Destroyer, Mounted Onslaught, and Spirited Charge also activate?
Last I heard is that most people don't even know who is making the overrun, you or the horse (Mount). And that you need improved overrun, not the mount.
Several abilities suggest that the rider, others suggest the mount. It's all just... a mess. So good luck getting exact answers that don't require the GM having to make some call or another.
Of course, I could be wrong, as it's been forever since I've looked at Overrun, much more since Mounted Overrun. But I just know that it was a mess then and I don't recall any clarification being issued.
That's pretty much the same thing that I've read from searching for answers. The mounted combat rules mentions the mount making a charge which is why I currently have the mount taking the improved overrun feats.