You have been hit by a force that may cause you to fall over.

You are immune to this effect if you are already Prone.

Attempt to resist this effect.

On SUCCESS:

You keep your footing. No effect.

On FAIL:

You are forced Prone.

Guaranteed Minimum

By default, a successful resist completely negates Knockdown. Some weapons or abilities may specify a guaranteed minimum in their description (e.g. “Knockdown — even on a successful resist, you suffer -1 AP next turn”). When present, that minimum overrides the standard “no effect on success” outcome. The Knockdown effect itself does not impose a minimum.