Expected: reap the forsaken's help file says that the edge makes your physical damage based off of int instead of str if it is an improvement, with an associated file pointing to damroll. This suggests to me that reap the forsaken should make base damroll based on int not str.

Actual: reap the forsaken does not do this. I'm not sure if it is just not conveyed on score and is still applied (or if the link in the helpfile is possibly misleading and not actually relevant), but damroll is observeably the same immediately pre and immediately post taking the edge. Log below:

Steps to reproduce:
1. Score combat.
2. Take reap the forsaken.
3. Score combat, observe no change.

*snippy*

You won't see any difference in your score.
BUT assuming you have the edge and your enemy is cursed, you WILL get your bonus from int instead of strength for the purpose of hits.
AND you'll get a bonus to spells.

It's a pretty strong edge.