Ina, the cheating heroine.

You don't need the Exorcism rune against those same Necromancers.

You don't need a rune that removes all negative effects from a unit?! And even more so in a game against Necromancers?! You probably confused it with the Magnadazer rune, although it can also be useful – for example, to steal vampirism.
It's best to have all the runes; you never know what might come in handy.