Seems to me the real problem is with Phantom letting you use the units abilities. Unit talents compete with spells more than ever for similar effects -- so if you play your cards right the Phantom spell is like a Gift + Summon spell rolled into one. I can get extra resurrections, blinding bombs, even more summons, etc. Being able to access those talents on the fly and without using up your spell action is a huge tactical advantage. Plus, once you've used the trick you wanted you still have a 2-round distraction.
Now if the Phantoms didn't have any talents they would still be useful as a summon for distortion mages -- but not nearly so abusable. And the rune mage wouldn't seem OP, imo.
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