Earth Spirit

You can place Observer Wards on the map quickly, especially on mid, by using Rolling Boulder.

First three abilities can destroy trees which can be useful against certain heroes.

The further the opponents are from their tower, the deadlier you are. You can potentially roll-kick an opponent under your tower.

Consider hijacking the second wave to establish creep equilibrium closer to your tower.

Ideally roll from the fog when an opponent is somewhat stationary, for example when going for last hit.

Secure active runes and use portals to gank other lanes.

Make use of existing stones in the fights as much as you can. Avoid over using Stone Remnants.

Earth Spirit is great at setting up kills. Communicate with your teammates as you will need follow up damage.

Pick up Aghanims Shard with max Geomagnetic Grip to save allied heroes.

Bring an Observer Ward to keep an eye on Earth Spirit's aggressive movements and dodge Rolling Boulders.

Be careful when playing at opponent's tower as Earth Spirit can roll and kick you under the tower.

Earth Spirit tends to roam a lot. Keep track of his movements and have teleport ready.

Magic resistance and spell imunity items are great against Earth Spirit's magical damage and disables.

Items that provide dispels are great at removing Geomagnetic Grip silence and Magnetize.