I was thinking something like this:
White Ethergaunt (FF)
Final:
• +2 Str, +6 Dex, +4 Con, +16 Int, +4 Wis, +2 Cha
• +10 Nat
• EWP (Etherblade)
• Enslave, Stupefying Gaze
• Material Jaunt, Immune to Spells (4th), Total Vision, Darkvision 60ft
• 13th Level Wiz casting
• 11 Aberration HD
• +5 LA
Start:
• -2 Str, +2 int
• +1 Nat
• Darkvision 30ft
Level HD BAB Fort Ref Will Special
1st 1d8 +0 +0 +0 +2 +2 Int, Material Jaunt, Lesser Stupify, EWP (Etherblade)
2nd 2d8 +1 +0 +0 +3 +2 Int, Darkvision 60ft, +2 Str, +2 Dex, Wizard 1
3rd 3d8 +2 +1 +1 +3 +2 Int, Total Vision 5ft, Wizard 2
4th 3d8 +2 +1 +1 +3 +2 Int, Nat +3, Charm Monster 1/day, Wiz 3, +2 Dex
5th 4d8 +3 +1 +1 +4 +2 Int, +2Con, Wis +2, SR 14, Wiz 4
6th 5d8 +3 +1 +1 +4 +2 Int, Nat +4, Wiz 5
7th 6d8 +4 +2 +2 +5 +2 Int, Nat +5, Charm Monster 2/day
8th 6d8 +4 +2 +2 +5 +2 Int, Wiz 6, SR 17, Total Vision 10ft
9th 7d8 +5 +2 +2 +5 +2 Int, Wiz 7, +2 Cha
10th 7d8 +5 +2 +2 +5 Wiz 8, Spell Immunity (1st), Stupify (Standard), SR 19
11th 8d8 +6 +2 +2 +6 +2 Int, Wiz 9, Nat +6, Charm Monster 3/day
12th 9d8 +6 +3 +3 +6 +2 Int, +2 Dex, Stupify
13th 9d8 +6 +3 +3 +6 +2 Int, Wiz 10, Nat +8, SR 22, Sp Immune (2nd)
14th 10d8 +7 +3 +3 +7 +2 Int, Wiz 11, +2 Wis, Total Vision 20ft
15th 10d8 +7 +3 +3 +7 +2 Int, Wiz 12, +2 Str, +2 Con, Sp Immune (3rd), Nat +9, Enslave 1/day,
16th 11d8 +8 +3 +3 +7 +2 Int, Wiz 13, Sp Immune (4th), Nat +10, Enslave 3/day, Total Vision 40ft,
SR= Ethergaunt SR only applys to arcane spells of 4th level or lower.
Lesser Stupify= Standard Action, DC 10+1/2 HD+Cha, 1 Int, Wis, Cha damage
Stupify (Standard)= Standard Action, 1d4 Int, Wis, Cha damage