I just noted that there is a lot of post here regarding OP Rune Plate item like for item as Act 1. If you fill that this items needs to be nerfed in next Errata 1.7 - please type in reply below: "I've signed this petition"
EDITED:
Option 1: To give it brown dice for every class and grey dice +2hp for mages. Still makes it best armor for mages in game and easy to implement.
Option 2: To move it to Act 2.
Here is probabilities for dices. To see that goblins and many other small pre-setuped monsters cannot do any dmg at all to mage with Runeplate.
Edited by Skiffling