New Champ Idea?

The idea of this champ is to be kinda a melee version of Vayne. The reason for this is because not many champs deal true damage because. Obviously its over powered, so the champ would need some kind of hard to use, or have the ultimate deal 15 True damage as a passive, and something like an active movement speed buff.

Ability List Ideas: = (Passive)

• Skillshot; Roots champ for 1 Second (+0.50 every upgrade, Deals 25 Magic Damage +50% of ap )
• shields you and nearby allies
• Active Aura; Deals Magic damage to nearby enemys
• Ultimate: (Name) ; Passive; Deals 15 True Damage every other basic attack [+5 every upgrade] ; Activate; 15% movement speed for 5 Seconds

I gave up in trying to create this lmao, I just wanted to get a post about a melee passive true damage champ, kinda like Jax's magic damage on hit passive.