Except Gandalf costs 3000, comes late, gets that ability at level 2-3 and Lightning Sword is not instantaneous, and gives time to your opponent to get away, no?
Helewen costs 1400, gets the ability by default and it can almost one shot a hero. If it's not a bug, then how exactly is it healthy for gameplay?
In case I haven't made my point clear, I enjoy powerful abilities, but I dislike abilities that remove 90% of a hero's health bar, no matter what exactly there may be to counter balance such a feat. Even more so if you consider that Helegwen has no hero killer aspects or roles. I would just reduce its damage to heroes, because it reminds me too much of Legolas' old Hawk Strike, where you could say bye-bye to your hero
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For the record, I am not frustrated (which it may seem like when I read back my general tone in the post), but I am just really baffled such damage is in an early to midgame hero with a point click ability.