Relics: Should be upgraded

Mythics: -Definitely- should be upgraded

Empyreans: Should be upgraded

Coin Weapons: I fail to see how these will be upgraded, I mean all they were used for was the weaponskill, if you want the WS that bad, just build an empy. It's like how my BLU was once able to use Knights of Round thanks to Corbenic Sword. I like it only for the fact I have it. It serves no purpose in endgame content, and like the coin weapons it won't be upgraded.

If I come off as blunt sorry, but the truth is that Coin weapons are not going to be upgraded as far as I've seen, there's no point to even keeping them if the ws becomes unlockable. When that happens, the endgame H2H such as Rygor or Oats are going to be far superior now with that weaponskill in your arsenal, and I recommend just putting the coin weapon in storage, because at least when you're doing you own thing you'll be able to wear them.

I was jumping happily when I got my Arondight, but by that time things had already surpassed it to the point that Arondight will never see the light of day unless I level a mule. It's my favorite sword aside from Excal and Haute, but I keep it in my storage because whenever I wanna play with it, I know it'll be there.