Re: OOC 5: I'm Out of Puns
Basically. There's an increase in strength that isn't tied to the Strength score, because 2e didn't have the commitment to defining everything, like 3e. So you just get a flat increase to damage based on the wizard level.
Also, unlike later versions, 2e's Enlarge works on objects, so you don't have to use it on a person if there's something better to make bigger.