Offlane NP build. Can work as fighter, space creator or rat(split)pusher

For offlane you have a few options to mess up the creep position for the enemy.

1) You directly pull the first creepwave towards your own tower using treants.

2) You re-direct the first creepwave back in between the enemy T1 and T2, which most likely will cause a double wave ( be wary to block the radiant hard camp with a treant if you are on dire ).

This will push the wave and give you a double or even tripple wave of XP. Be wary of being killed under your tower and getting 0 XP out of this. Use treants to draw aggro and lead them deeper into your own territory. This requires a ward to block the easy camp, else you will just make things easy for your enemies.

( If you are on radiant, make sure the enemy can not pull their hard camp close to your tower ).
This technique will also cause the enemies to tank creephits and potentially miss lasthits under the tower if they choose to take the creeps under the tower. Note: If this gets messed up, you might lose your T1 tower under 3 minutes to a big creeppush.

3) Use your treants and hero to block the creepwave(s) in order to have the enemy creepwave close enough to your own tower that you will be safe.