>>716238679Goes well with both, I used it on a magic build. The gravelord sword has terrible scaling, so you just need the minimum stats to wield it.
If you want to stop at 16 str (2h only) there's a bunch of other good weapons you can buff\infuse (you can also two hand the zwei for example)
Another funny (but very late) low req weapon is the obsidian greatsword. It's buffable and the buff affects the special attack
Another funny weapon (but totally different build) is queelag's fury sword
Also, if you did a bunch of str/faith build, I hope you tried Grant at least once. Fun times really