you don't see the darkvision on the character sheet (its a property not a feat) and... compounding the problem of knowing that you have it, its a property that doesn't show up on your character sheet.
Rest assured that you do indeed have it, and also rest assured that it doesn't do a whole heck of a lot in the game mechanic anyway
![Cry :'(](https://forums.layonara.com/Smileys/default/cry.gif)
I liked 2ED infravision better.
Edit: You cannot have a half elf/half giant character. Theoretically it would be possible (IC wise) but in the game mechanics the only subrace available is half human half giant. This is the same reason only Human Aasimar and Tieflings are available.
Hopefully in NWN2 subraces will be a lot more flexible and work more properly overall.