World of Ulos

Kalso's wooden sword has a retractable blade inside it;

The entertainer flips a small switch at the hilt of the sword. When he does so, the wooden cover detaches, revealing a steel blade underneath. - Deathmatch at the Colosseum of Ashes (RPA-SQ1)

Kalso, the clown performer, will be seen using his sword in the Colosseum of Ashes as he battles a fake, puppet dragon. - Tome of Encounters (RPA-Tome-SQ1-27)

Kalso may approach you in the grandstand. Assuming it is part of his act, you are caught unawares as he smashes his wooden sword down on your head. Flipping a switch, he reveals a steel blade hidden under the wooden cover.

• You overpower him and he begins to cry. Hoping you won't hurt him, he offers you his trick sword.
• The crowd laughs at your defeat.