Kuo-Toa scepter: should I allow the 4d6 lightn…

Kuo-Toa scepter: should I allow the 4d6 lightning damage?

@JeremyECrawford Hello Jeremy! One of my players picked up a Kuo-Toa scepter. Should I allow the 4d6 lightning damage or just the basic 1d6 blunt or something in between?