steeldragons
Steeliest of the dragons
Part and parcel of magic items & devices: rings, cloaks, anything "worn," but particularly armor and weapons (as far as we always did/used in 1e, anyway. Not sure, now, if that was in the "rules" somewhere or just a houserule), is that they "resize" to match their current user/wielder.
Obviously, the giants (for example) great massive multi-ton thick sword that did 3d12 + whatever to the party can't do that for the PCs. It will shrink down -maybe with a slightly wider blade or a slightly longer pommel or something that marks it as "giantish" in make or design. But (DM has to decide) it will do damage as a normal Longsword or broadsword or -at least- down to a two-handed (for a Medium critter even if the giant used it with one hand) sword +whatever magical properties/bonuses it possessed.
Obviously, the giants (for example) great massive multi-ton thick sword that did 3d12 + whatever to the party can't do that for the PCs. It will shrink down -maybe with a slightly wider blade or a slightly longer pommel or something that marks it as "giantish" in make or design. But (DM has to decide) it will do damage as a normal Longsword or broadsword or -at least- down to a two-handed (for a Medium critter even if the giant used it with one hand) sword +whatever magical properties/bonuses it possessed.