User blog comment:1111kkkk/Damian/@comment-24036535-20150825004549/@comment-24036535-20150825212807

Here's the thing about all of the abilities you listed. They are limited in some way. Akali's ult has a total ratio of 150% across all three charges, but that involved three charges, not a single cast. While Akali's mark is 90% total ratio, which only get's the mark's damage if popped. Damian get's his mark damage no matter what, while having good bases AND good ratios. Something which grants a lot of damage power to a champion. There's a reason few if any champions in league have both. (Maybe Diana, but she's limited in other ways).

There's a reason AP ratios have become weaker: Riot has been trying to limit how much damage a single spell can do, they don't like the concept of "one-shotting", hence why it rarely happens. Even if all of his ratios are on two abilities, those abilities have obscenely high ratios and base damage, a fed Damian would regularly one-shot enemies on the other team.

Another problem is when a caster only has two damaging abilities, casters should usually have more than two damaging abilities.