Kyle
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Amber, aren't you getting anything mixed up? As far as I remember, the "ring of the mage" lasts for 50 rounds, and aren't armor values dependent on the spall power?
The mentioned spells indeed cast armor for 50 rounds, by the way, the effect of combined parts hasn't been canceled either...
and regarding the 50 rounds, it seems that the developers liked this number, so they put it into several artifacts. :D
Sincerely.
Кто состоянием своим доволен, тому жить весело. (с)Алекса́ндр Васи́льевич Суво́ров