OK, I made an Item and can't remeber where its special ability came from

[Abraxas]

OK, I added a belt to my game that allows a character, once a day, to increase the damage he does with a melee attack. If the character hits with a light weapon he adds 1d6 damage, with a one handed weapon he adds 2d6 and with a 2 handed weapon he adds 3d6. I am fairly certain that I read a feat, spell or special weapon ability like this but I can't for the life of me remember where. The reason I need to find it is to price out the belt (the characters are now approaching teen levels and are lookibng to trade it).

Does anyone know of such an ability, feat or spell? Or did I just imagine it all.

 

[jbuck]

could it have been Improved natural attack?
or maby enlarge object with monkey grip?
or enlarge person?

 

[Abraxas]

No, those aren't it.
It may have been a spell in one of my third party books - which narrows it down to about 30 or 40 books :\

 

[boolean]

Belt of One Mighty Blow. Miniatures Handbook, p. 42.

 

[Abraxas]

Thank You