Talk:Kassadin/@comment-1.55.175.96-20120213082028/@comment-88.186.19.90-20120213134832

There's a difference between the two.

Riftwalk's main point is to give Kassadin mobility, hence the growing mana cost to avoid abusive escapes; with some damage to finish off fleeing opponents and keep players happy (even the AP ratio is pretty shitty). Kog's ult is only used to deal damage, you gain no utility from it.