Sejauni needs a higher mana cost on her W.

Right now, she needs high mana costs to make up her potent ganking power and damage. In the jungle, she can just keep stacking HP and never run out of mana by conservatively using her Q and E combo to clear.

How does it make sense for an ability that strong to cost only 40 / 35 / 30 / 25 / 20 MANA? I mean either keep it at 40 mana at all ranks or lower the mana cost on her Q by 20 and then shift it to her W.

Not long ago, Sion's E got nerfed because it dealt too much damage for a wave-clearing ability that costs 35 mana. For the same reason, I just can't see why Sejauni deserves to have low mana costs all around.