I've been looking at some Mercedes guides and I had a look at the suggested skill builds of each of them.
All of them suggested to max Lightning Edge, and leave Hero's Will at lvl 4.
However, I think that 1 minute's cooldown of Hero's Will can be a life saver during boss fights and is more important than just 5% of extra damage in Lightning Edge. Is there a good reason to max Lightning Edge over Hero's Will? Thanks :)