Ability focus for fear makes sense.
Per the original text, create spawn only goes with Oppress Sleeper. I guess the energy drain just creates wights like normal.
My bold there. So either we specify something, or victims become wights (assuming there's no preventive magic used first).SRD said:A character with negative levels at least equal to her current level, or drained below 1st level, is instantly slain. Depending on the creature that killed her, she may rise the next night as a monster of that kind. If not, she rises as a wight. A creature gains 5 temporary hit points for each negative level it bestows (though not if the negative level is caused by a spell or similar effect).
As long as the gaze is just a negative level gaze and doesn't cite the spell, it shouldn't grant any temporary hit points to undead (that is, the spell does that but not generic negative levels). Plus undead are immune to the gaze since it allows a Fort save!
The thing with wights is that energy drain that kills a character always creates spawn or a wight. From the SRD:
My bold there. So either we specify something, or victims become wights (assuming there's no preventive magic used first).