You can also blink away from whatever blade lord's annihilate (frontal cone shit?).
You get "stunned" right before he casts.. so just strafe until you stop moving, blink.. saved.
Or you can eat it to the face with Ice block.
Also.. I figured AE to refresh your AP stacks was a widely known thing...
use it on knockbacks, movement.. basically anything where you can't spend 1.5s~(or so) to refresh with AB.
Greater Invis works wonders on just about anything...
and it will be even better with a 90s cooldown