3 Suggestions to make Morde a Bruiser/Tank like Riot wants without giving him CC

1: Morde's shield value scales with his Maximum Health

Something like 20-30% of Max Health based on level as the shield value instead of 90(+30*Level)

Emphasize Morde's Health builds and allow him to efficiently use Sunfire Cape and Visage. Riot is already making his shield generate based on his Max Health, so they might as well double dip.

2: W deals percentage of Max Health damage per second (scales with AP) and converts that into Bonus Armor and MR for Morde for the duration

If you want a Bruiser or even a Tank you really need some sort of Anti-health scaling, and what better way to do that then to allow Morde to get tankier from doing it.

3: E loses AP scaling to gain % Morde's Max Health scaling

With all that Health he is building why not allow him to benefit from building it?

Obviously the base damage could be lowered for this new scaling, but it would benefit Morde in so many ways.