Edge of nights spell shield lasts 10 seconds.

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It is because banshees only gives defensive stats, as well as you need 40 seconds of not getting damages to recharge it.

Now hold on, what exactly is peoples argument with Edge of Night. Is the active really that OP? or is it the stats that go with it?

The reason why Banshee's veil isn't out of line, is because it's a rather slot inefficient item, designed to be a niche pick up mainly against magic damage.

Meanwhile, aside from the ridiculous popularity of Lethality in general. EoN is pretty much core on anyone building Lethality. Granted their are only 3 Lethality items to begin with, but EoN is pretty much just as good as any of them. Anyone who builds damage can easily pick this up without much sacrifice, and have a good defensive utility.

Personally, I think the Active itself is fine. It Provides a useful utility for it's (intended) user Assassins, by allowing them to block one instance of CC, making it more difficult to peel their engages. (Though Arguably, it probably could afford to have a longer cooldown.) But EoN should be picked up for it's active component, not just because it has good stats, with a strong active tied to it.

Basically, I feel like EoN should be less slot efficient, making it's active component more of a niche pickup. (Similar to how Zonya's Hour glass and Rylai's Crystal Scepter got nerfed for mages) Reduce the amount of AD it gives, like say down to 40. (Removing pickax from the build path), increase it's cooldown back to 40 seconds, (60 tops) And reduce the cost to compensate.