Imperius

1-3: if high-health-enemy-warriors.
4-2: counter to slows + roots.
16-3: if Imperius is focused by enemy team.
20-3: if Imperius is focused by enemy team or Imperius is single frontliner.
..
weak against
- kiter (Tracer, Genji)
- anti-heal (Ana)
- blinds = no trait triggered
..
Q also as defense to peel backline.
W waveclear - mid important.
E selfheal - with basic attacks.