8th level suggestions. Think of these as spells that focus on abilities associated with good leadership skills. Things that would come in handy when considered a leader such as communication skills (Speak with Anything) or commanding an army for an attack (Screen) etc.
Screen
(Player's Handbook v.3.5)
Illusion (Glamer)
Level: Sorcerer 8, Wizard 8, Trickery 7,
Components: V, S,
Casting Time: 10 minutes
Range: Close (25 ft. + 5 ft./2 levels)
Area: 30-ft. cube/level (S)
Duration: 24 hours
Saving Throw: None or Will disbelief (if interacted with); see text
Spell Resistance: No
This spell combines several elements to create a powerful protection from scrying and direct observation.
When casting the spell, you dictate what will and will not be observed in the spell's area.
The illusion created must be stated in general terms.
Thus, you could specify the illusion of yourself and another character playing chess for the duration of the spell, but you could not have the illusory chess players take a break, make dinner, and then resume their game.
You could have a crossroads appear quiet and empty even while an army is actually passing through the area.
You could specify that no one be seen (including passing strangers), that your troops be undetected, or even that every fifth person or unit should be visible.
Once the conditions are set, they cannot be changed.
Attempts to scry the area automatically detect the image stated by you with no save allowed.
Sight and sound are appropriate to the illusion created.
A band of people standing in a meadow could be concealed as an empty meadow with birds chirping, for instance.
Direct observation may allow a save (as per a normal illusion), if there is cause to disbelieve what is seen.
Certainly onlookers in the area would become suspicious if a marching army disappeared at one point to reappear at another.
Even entering the area does not cancel the illusion or necessarily allow a save, assuming that hidden beings take care to stay out of the way of those affected by the illusion.
Moment of Prescience
(Player's Handbook v.3.5)
Divination
Level: Sorcerer 8, Wizard 8, Luck 8,
Components: V, S,
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 hour/level or until discharged
This spell grants you a powerful sixth sense in relation to yourself.
Once during the spell's duration, you may choose to use its effect.
This spell grants you an insight bonus equal to your caster level (maximum +25) on any single attack roll, opposed ability or skill check, or saving throw.
Alternatively, you can apply the insight bonus to your AC against a single attack (even if flat-footed).
Activating the effect doesn't take an action; you can even activate it on another character's turn if needed.
You must choose to use the moment of prescience before you make the roll it is to modify.
Once used, the spell ends.
You can't have more than one moment of prescience active on you at the same time.
Speak With Anything
(Masters of the Wild: A Guidebook to Barbarians, Druids, and Rangers)
Divination
Level: Druid 8,
Components: V, S,
Casting Time: 10 minutes
Range: Personal
Target: You
Duration: 1 minute/level
This spell grants you the effects of speak with animals, speak with plants, and tongues, enabling you to communicate with any living creature, including unintelligent ones such as normal plants.
You can ask questions of and receive answers from any creatures, although the spell doesn't make them any more friendly or cooperative than normal.
You can make yourself understood as far as your voice carries.
You also gain the ability to speak with stone, metal, earth, water, or any other solid or semisolid object or terrain feature as though under the influence of stone tell.
Any such object or terrain feature can relate to you who or what has touched it, as well as what is covered or concealed behind or under it, providing complete descriptions as requested.
However, an object's perspective, perception, and knowledge may prevent it from providing the details you are looking for (DM's discretion).
This spell does not include a speak with dead effect, so you cannot access the past memories of dead creatures.
Though you understand every creature and object, you may speak only one language (or rough equivalent) at a time.
Visions of the Future
(Player's Handbook II)
Divination
Level: Cleric 8,
Components: V, S,
Casting Time: 10 minutes
Range: Personal
Target: You
Duration: 1 hour/level or until discharged
You view events slightly before they happen, gaining time to react to them.
You gain a +2 sacred bonus on all saving throws and +2 dodge bonus to Armor Class.
Once during the spell's duration, as an immediate action, you can choose to discharge the spell to gain a greater bonus.
When you discharge the spell in this manner, you gain a sacred bonus on all saving throws and a dodge bonus to your Armor Class equal to 1/2 your caster level (maximum +25).
This bonus lasts until the beginning of your next turn.