Powerful build, the opposite does it exist?

[warrondilor]

I think have seen somewhere a feat or ability letting you count as one size smaller, can't remember where though. It could be kobold related.
Does anyone know the name of this ability and its source?

[Deophaun]

Slight build from http://archive.wizards.com/default.asp?x=dnd/we/20060420a

[warrondilor]

Great that's it!

Thank you ☺