User blog comment:JmLyan/Arath, the Power Charger/@comment-10958553-20130801191529/@comment-7481207-20130801225009

Marks could do the same thing, but there are several issues to that approach:

Consumed Hyper Marks generate charges differently. If all tier 2 spells simply generated one charge, there would be few reasons to not use Charge Beam for it, as it deals the most damage and is the easiest to hit with.

Consumed Max Marks works perfectly fine though.

Consumed Over Marks would be the worst of them all, as having the same CC on all three abilities would be both boring and broken (his shield would force the other two abilities to use short duration soft CC). Not having CC as the Over Mark trigger would leave him without CC, which isn't a good position for a non-assassin mage.

And the tier 3 spells would still have to have different effects, since the only way of getting empowered tier 3 spells is using Overdrive, their effects need to feel special.