To give some more usefulnes for old legendary heroes G. Owl and Karnov (who don’t even have costumes, which are not necessary before other changes), their special skills’ direct damage should be increased!
On modern standards, Karnov’s 290% of dmg on slow is just ridiculously low with only one other effect. It should be increased to at least 330/340% to match newer heroes better.
G. Owl is also very broken, providing only 280% of base dmg (on VERY SLOW mana speed), which isn’t anywhere near enough. His mana speed should either be slow OR his special skill’s stats should be increased some way (mana buff for himself, more dmg?)
Why not costumes? Because the players already owning these heroes wouldn’t benefit from them at all, since they would be challenging to get. Instead, buffing these old heroes works much better, making them a lot more useful against the ridiculously strong S5 and other new heroes.