Haunt gives global presence, so you are always two seconds from any fight even while farming the opposite side of the map.

During Haunt your illusions almost always proc Desolate because they appear behind enemy heroes with no nearby allies.

A hard lane build prioritizes Dispersion early and delays Desolate when you are getting zoned.

A kill lane build maxes Desolate first when paired with aggressive supports who can isolate enemy heroes early.

Radiance delays your power spike by over 10 minutes, so Diffusal Blade is now the preferred first item to fight at 16 to 18 minutes.

Blade Mail early gives you a fighting item before Radiance and helps in chaotic mid game teamfights.