Karthas needs something

Karthas' W, Wall of Pain, doesn't even hurt to walk through. Could be better called doorway of slow. It needs a change.

You could make his W have spirit hands that pull enemy champions toward the wall or damage them if they stay in or near it too long. Something that instills fear. If his wall touches the environment what it changed it.

If Karthas can control his soul when he dies why can't he do that more often in a more skillful way. Have you seen his splash art. Look at those claws; he could use those to hurt champions.

His lore says he's haunting. Why does he not haunt people more with spirits or something