My next champion (mechanically complex juggernaut)

For next few days, i will be working on a massive champion concept - a juggernaut boss. I want to make true juggernaut, who would follow not only key aspects of the class (low mobility, tankiness, massive damage, low CC, low range), but would feel like to create true massive terror and seeing him in lane should cause you to think only about running away, like some kind of other game boss, who is simply to strong to beat face-on. I will try to make good and interesting back story, complex and interesting kit, maybe will even do the voice acting and so on.

Key elements i don't want to use form other juggernauts:

1. pulls, slows and all other kinds of CC;
2. high mobility;
3. dependence on an ally, speed boosts;
4. limited duration transformations;
5. mobility, CC, ability spams.

That i want to use form other juggernauts:

1. slowly building fear on enemies of their inevitable death;
2. strong defensive tools and slowing negates;
3. protect yourself through dishing out massive damage;
4. progressiveness, becoming stronger as game goes on.