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Let's talk about Aegislash and its evolutionary tree.
Both Honedge and Doublade make sense for how they are wielded. The tassels wrap around the arms. One could say that they help with the grip and potentially enhance strength of strike by using that to swing itself harder when you swing it.
Now here's the issue.
Aegislash.
It's two tassels connected to the sword. You can only wield it in one hand or both assuming you like having your hands tied to a sword. I assume the shield is detachable, but then if you wield it, you have to rely on your own upper body strength, unless it still can be used for its king's shield move.
Am I the only one that thinks it would be better if it was two tassels connected to a sheath instead?