It's one of the few chinks in an elf paladins armor. Or that drow ap.

There are non-limited items as follows:
2x ring for +2 each, running total +4
2x neck for +1 each, running total +6
body +3, running total +9
about body +3, running total +12
2 x bracers +2 = running total +16

Throw in juggling balls, a basic +con belt, and you are already at +18, and hardly weighed down at all, even as a weak race.

You can easily expand on the above as your con drops, and this ignores and +con gear that you might happen to be wearing in other slots simply because it is nice gear (e.g. plain phylactery).

Honestly, if Nererial could take a full rot from a hero with the edge and only lose 4 con, it's not op. It may be somewhat tedious to sit there in your crappy anti-rot set, but it isn't really overpowered.