Prevent Ivern from getting 3 buffs from the get go by warding both of the river bushes at 1:25. This should give you enough time to vertical jungle.
He needs to channel his Passive to mark a jungle camp. If you do see Ivern channeling his Passive- just auto him once and it should make him reset the channel: slowing his clear or preventing him from stealing.
Ivern is very easy to invade since he can't 1v1 most Junglers. But be aware of your surroundings and back away if necessary.
As Ivern will be building utility items to help his team, looking for picks before a team fight occurs will severely reduce Ivern’s team fight potential.
If you have a split pusher on your team, try to get that person ahead early so you prevent a team fighting situation. This is great against Ivern because the enemy will be missing a damage dealer- reducing Ivern’s usefulness in team fights.
Ivern will use his Bushes to scout vision for his team. If a bush has been placed nearby- put two and two together and expect that Ivern is in the vicinity.
While not strictly a power spike, if Ivern has the opportunity to steal your level 1 buff, you will fall behind early. Prevent this by placing wards in the river at 1:25.
Once Ivern hits level 6, he will unlock Daisy . This increases his gank ability and potency on the map. Try to delay his power spike by stealing away his camps and counter ganking when necessary.
Ivern usually hits his power spikes between 11 mins and 20 mins when he hits his 2 item power spike (Redemption and Ardent). Always take his Redemption in consideration when trying to kill the enemy.