Wicc
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I think Nix are overpowered. Reducing the enemy's attack by 60% is too much. In the late game, with heroes having similar stats (35+ with a red orb), they are simply impossible to kill. Only the Grey's ability counters them. I think it should be reduced to 40%, and the base defense should be reduced from 20 to 16.
I'm also waiting for a nerf to Luna. Let's say +x1.5 to damage instead of x2 would be just right.
A more realistic option would be to give Luna a +50% bonus, but make the wall itself SP*15 instead of SP*10. This way, Luna would remain roughly as she is, but it would be easier for other heroes to rotate the wall.
I would also like to see all artifacts rebalanced in terms of value.