Level 3 picks:
Dragon Turtle Shell - natural weapon attacks shifted down a size category every 5 CL
Detect Desires -detect thoughts, but for what they want at the moment and not what they're thinking
Shining Scales - +5 AC, attacks act like good/silver weapons , and a breath weapon modifier
Reflexive Barrier - half our CL in defection bonus to AC
Reverse Arrows - protection from Arrows, but it shoots back ranged attacks when they get soaked completely by DR. The spell text is unclear on if this is just DR from the spell or our total amount.
Level 2 picks:
Seducer's Eyes - not sure on this one. It gives us +6 to any charisma based check, but it requires the target to be conceivably find Viserys physically attractive.
Divine Presence - an intimidation bonus that ranged from +5 to +15 based on how opposed their alignment is to Viserys'.
Perceive Cues - +5 competence on sense motive and perception
Protective Spirit - tries to shoot down attacks of opportunity.
Investigative Mind - advantage on all appraise, knowledge, linguistics, and spellcraft checks.
Raiment of Command - +5 untyped bonus to diplomacy and intimidation and any creature with 3 or more int takes a -2 to all opposed checks.
Level one picks:
Strand of the Tangled Knot - -10 penalty to the next attack made against us after casting, and criticals treated as regular hits. Not sure how that works out for a permanent spell, but even if it's only the first hit in some number of hours it'd still be good.
Sure Casting - not sure we can do this one, but we've done stuff not on the permanency list before and +5 CL to piercing spell resistance is nice.
Entropic Shield (if possible with
Invisible Spell) - a 20% miss chance is pretty decent, but if it's visible all the time it'd be pretty irritating on the day to day.