Player > Ancestry > Halfling > Feats > Cobble Dancer

Cobble Dancer FEAT 13

Lost Omens Character Guide p.45

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HALFLING

You know how to take advantage of foes thrown off-balance by unstable flooring, loose cobblestones, or similar impediments. While in an outdoor urban environment, you can Step into difficult terrain and enemies in difficult terrain are flat-footed to you.