2012-03-21, 07:40 PM
I can only answer the last bit: if it's forced to stay Rare and then you recube it without a lock, it won't necessarily go Epic. Each cube is an independent random event. There is no mark on the item that means "its time to go Epic has come".
As for whether locking the primary line will prevent a rank upgrade: I'm wondering the same thing.
As for whether locking the primary line will prevent a rank upgrade: I'm wondering the same thing.