Lol, what's the use of divining the orb?

Dispel the fog of war in an area for 2 seconds.

Similar to the summoner's skill insight, but the available range is too small compared with the display area.

Divination ball (ornament) (0g)

Uncover the fog of war. If an enemy hero is found, he will remain visible for 5 seconds. (120 second cooling time)

Divination ball (level 9)

The usable range is increased from 2500 yards to 3500 yards. (120 second cooling time)

Visual sphere (level 9+475g)

The effective range is 4000 yards. (90 seconds cooling time)

observe

Expose your field of vision anywhere on the map for 6 seconds. The cooling time is not clear. It didn't take long, anyway, it was less than 50 seconds, and the exposure range was particularly large.