Idea
Edit:
Imagine you having a sword but on a special mod socket it has different stances where you can actually select a stance/animation.
Option/Reasons
Example: quick fang sword stays the same but has a different stance this will be unique to one and other to show out on PVP & PVE.
Variety
Also Imagine if this game has different melee weapons so that there's enough to play with.
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Do you want to turn Destiny into Witcher? Tracking with witcher senses is already here, now you want a slasher mechanics...