A character on foot, who is armed with a spear or pike, can brace the polearm by ramming its butt against the ground. This takes a ready weapon action to perform. Once braced, the character cannot move or turn without losing the effect of the bracing.
If a mounted character moves into the strike range of a braced character and the braced character declares a stand and attack reaction to this movement, the braced character gets a number of advantages in attacking the mounted character (or his/her mount):
Weapon\Mounted character's speed | Slow (e.g. walk) | Average (e.g. trot) | Fast (e.g. canter) | Breakneck (e.g. gallop) |
Bracing bonus on damage dice roll (spear) | +0 | +1 | +2 | +4 |
Bracing bonus on damage dice roll (pike) | +1 | +2 | +4 | +6 |
As with any other stand and attack reaction, the braced character may declare the reaction (and resolve the attack) part way through the mount's movement action.