Arms & Armor Tests
Both blade and barrier can be turned on its master.
1-6. The attunement's source goes awry. The arm or armor becomes associated with another type of lord instead, making what would be demonic potentially fey, or that which would be angelic that of elemental earth. Roll 1d5, rerolling to get another besides one's own lord in this case if need be:
[1] angelic, [2] fey, [3] elemental, [4] demonic, [5] devilish.
7-13. Accursed thing! The item is enchanted wrongly, now having one or more fell features (roll 1d6):
[1] It causes the opposite of what it was meant to do.
[2] Its bearer suffers under the Blessing & Curse of a random lord (most likely the latter, link)
[3] Its bearer only thinks the item works as magically intended. It doesn't, much to his peril.
[4] It cannot be gotten rid of except as one would remove a curse.
[5] Its bearer no longer wishes to part with it, having to save vs. spell with a -10 penalty/ make a Will save DC 25 or will consider it 'precious' from now on.
[6] Reroll twice.