Hate to disappoint but I've read on several leaks that the blades are just used in spartan rage mode.
They are still upgradable though and even the trophy's name why fight it? Meaning why contain the rage. So in order to fully use the complete version of them you need much rage. Logical.
Interesting they'd give it an upgrade tree. Must get it relatively early because theres no trophy for actually getting it.
Now that makes a lot of sense indeed, especially since the Blades of Dragon don't seem to have any upgrades. Well, that leaves us with the axe and the blade of chaos.
There is a trophy for getting the blades (of Dragon) and there is another for fully upgrading the blade (of chaos).
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