Save DC for ability drain

[moon glum]

There are a number of monsters that have a saving throw DC listed next to their ability drain. How is this save handled? Is it a save to recover the lost point(s) after resting, or is it a save to negate the initial drain?

Here is an example (the dread wraith):

Melee incorporeal touch +20 (3d6 negative energy plus 1d8 Con drain [Fort DC 23])

Do victims get a DC 23 save to negate the con drain?

[ErrantPursuit]

Yes, it is shorthand and so a little awkward.

Melee incorporeal touch +20 (3d6 negative energy plus 1d8 Con drain [Fort DC 23])

The addition of the Con drain is like poison. They hit you, you take 3d6 Negative Energy and save DC23(Fort) or take 1d8 Con drain.