Talk:VPBE/@comment-24385282-20151004015443/@comment-35229418-20151004114430

Evelynn uses W to move faster between camps in the jungle, which results in too much roaming speed. By making it cost mana you're forced not to use it, lowering your speed.

Fun fact: people are complaining that she easily runs out of mana. W also deactivates her passive, which means no bonus mana regen. Now she will paradoxically have more mana regen, because if no one uses W her passive stays active. This comes at the cost of roaming speed.