Finally got enough Leadership to hire one Rune Mage. Must say... AWESOME.
Firstly, something I did not notice before. He has the RUNIC ability that activates only in battle - it does the following:
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Might Runes: Increases the damage (minimum and maximum) of the Rune mage by 2xNumber of Might Runes. (Basic damage is 40-55, with a maximum of 20 Runes, he does 80-95 Damage!

)
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Mind Runes: Increases the HP of the Rune Mage by 10x Number of Mind Runes! They have a basic HP of 450, with the maximum of 20 Runes he'd have 650 HP - not that high, but high for a Mage.
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Magic Runes: Depending on the number of Magic Runes you have, the Rune Mage's basic attack can impose different negativ conditions with as 30% chance per hit. I have only got 1 Rune right now, with that, the effect is Helplessness. I wonder what will be the effect on higher levels...
As for the Talents - Destruction is a very Powerfull Astral Damage beam attack, although it hits friend and foe alike, if you position the Mage correctly (with 3 speed it is easy) you can hit multiple enemies at the same time. Resurrection is more powerfull then an Inquisitor's, and also increased by Mind Runes. Illusion is random, and the summoned unit is placed next to the Rune Mage.
I've found 4 of them so far, though it'll be long before I can recruit another one...