Can you please elaborate a big more? I don't really get it
If I make a legendary weapon a mythical, will it do anything
Yes. If you upgrade a weapon's grade, the efficiency increases. If you hit lvl 55 and your weapon is Legendary, you need to also upgrade it to mythical to get the highest possible efficiency.
I know I just want to know if the increased efficiency actually does anything.
Yeah. It increases the damage. Efficiency is literally damage.
Yes it does
What do you think?