Now mind you I haven't been hunting in OTF terribly long, but it seems like the Ithzir are a bit buggy in the dopamine department. They have a higher-than-normal TD against Song of Depression (#1015). Why? Note: I believe Adepts, Scouts and Janissaries are the same way.

Initiate is 47 higher-

>inc 1030
Links of ethereal chain appear and wrap themselves around your right wrist, clinking noisily as you prepare Song of Sonic Disruption...
You weave another verse into your harmony, directing the sound of your voice at an Ithzir initiate.
CS: +406 - TD: +360 + CvA: +19 + d100: +11 == +76
Warded off!
>
>inc 1015
You change your tune slightly, adding the element for Song of Depression to your song...
You weave another verse into your harmony, directing the sound of your voice at an Ithzir initiate.
You begin singing a harmony of depression and lethargy.
An Ithzir initiate appears to be struggling with the debilitating force!
CS: +406 - TD: +407 + CvA: +19 + d100: +28 == +46
Warded off!
An Ithzir initiate is unaffected.

Herald is 46 higher-

>inc 1030
Links of ethereal chain appear and wrap themselves around your right wrist, clinking noisily as you prepare Song of Sonic Disruption...
You weave another verse into your harmony, directing the sound of your voice at an Ithzir herald.
CS: +410 - TD: +373 + CvA: +9 + d100: +36 == +82
Warded off!
>inc 1015
You change your tune slightly, adding the element for Song of Depression to your song...
You weave another verse into your harmony, directing the sound of your voice at an Ithzir herald.
You begin singing a harmony of depression and lethargy.
An Ithzir herald appears to be struggling with the debilitating force!
CS: +410 - TD: +419 + CvA: +9 + d100: +53 == +53
Warded off!
An Ithzir herald is unaffected.


Seer is 48 higher-

>inc 1030
Links of ethereal chain appear and wrap themselves around your right wrist, clinking noisily as you prepare Song of Sonic Disruption...
You weave another verse into your harmony, directing the sound of your voice at an Ithzir seer.
CS: +410 - TD: +385 + CvA: +19 + d100: +44 == +88
Warded off!
>renew 1015
You sing with renewed vigor!
An Ithzir seer appears to be struggling with the debilitating force!
CS: +410 - TD: +433 + CvA: +19 + d100: +39 == +35
Warded off!
An Ithzir seer is unaffected.
Renewing "Song of Depression" for 6 mana.


Griffin is equal -

>renew 1030
You sing with renewed vigor!
You continue to sing a disruptive song.
CS: +410 - TD: +375 + CvA: +25 + d100: +29 == +89
Warded off!
Renewing "Song of Sonic Disruption" for 10 mana.
>renew 1015
You sing with renewed vigor!
A war griffin appears to be struggling with the debilitating force!
CS: +410 - TD: +375 + CvA: +25 + d100: +24 == +84
Warded off!
A war griffin is unaffected.
Renewing "Song of Depression" for 6 mana.

I seem to recall someone once posting that they had resistance to some mental attacks because they were "alien" and thus had different minds. I could be mistaken though.

Sweet is the sound of the pouring rain,
And the stream that falls from the hill to plain.
Better than rain or rippling brook,
Is a mug of beer inside this Took.

Their 1001 resistance is probably too low. They are mental, but implementation is spotty.