the description isnt fitting for the flail at all... a massive flail in size and length thats made of iron and then weighs 3lbs... doesnt sound like a flail that should only be used by giants to me...

This flail is massive, both in size and length. Dark scales line the
barbed wires, five total that are either heavily stained with blood or
naturally a crimson tone. The haft is twined together with strips of
boar hide, and it is bent to fit the grip of a massive creature. It
was said to be the weapon of 'slumber' as it put many a foe into
eternal slumber upon facing such a weapon.

A drake-scaled flail named, 'crimson slumber' is a flail, made of iron, and weighs 3 pounds 15 ounces.