If they are ghost they should pass trough walls right?

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I think that passing through walls should be flash's main advantage over ghost... However, ghost should easily win over any sort of distance. If its speed needs increased, or if it needs a slow reduction, then they should add that, but flash should win with walls involved.

However, adding wall-ghosting to Noct would be interesting.

imo replace flash with a version if mark/dash, that is balanced for summoners rift. the only way to balance the summoner with the other existing ones.

you can still pull flashy plays by engaging on someone with this, or even escape over a jungle camp like lee sin always does. but it wouldnt be 100% reliable in every scenario like flash. meaning other summoners might be a valid alternative for once.

makes you think if you want mark/dash for mainly aggressive plays or rather ghost because you need an escape.