Hm. I do not know if this one is worth 6 mana.
+1 Armor and the void armor ability together make a Lorna with piercing weakness (i.e. everyone gets a free hit) and the sad fact that if the monster has more than one armor a bigger hit will take down more of that than when hit with Lorna as summoner.
The amplify ability is already contributed by some monster so I'm not sure if that is worth 3 more mana.
The void armor in general make the combination of taunt and resurrect ability interesting, since resurrect brings back a monster only with 1 health but full armor. magic was so far a weakness of resurrect hence I mostly used it in the weak magic ruleset which basically is a void armor ability for everyone.