Using Smite on the Greater Murk Wolf will summon a nature spirit that grants sight over the nearby crossroads for 75 seconds. Whenever an enemy champion comes in range of the nature spirit, it will chase them for a short duration. This bonus can only be claimed once per spawn.

Additionally:

It actually also pings and throws up a flag on the mini-map when it has spotted an enemy, though I've observed this can get lost in the bustle of a 5 on 5 Summoner's Rift game.

It will not detect stealthed enemies.

Usage:

Vision is useful so this ward is...
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