Diablo – A fantomatic treasure goblin is following me

For information on Treasure Goblins, take a look at this previously asked question.

From my testing, there is no other way to effectively close the portal besides interrupting the cast and/or destroying the treasure goblin. In Hell mode, all enemies have increased resistance and increased HP. Therefore, you HAVE to output more DPS to prevent him from getting away.

From what I have noticed, once his portal is down, you have a set amount of time to kill him or make him run away from the portal before it doesn't matter: He will get into the portal and your loot is gone.

A few recommendations:

• Try cornering him. This will obviously try to prevent him from running away and allow you (and your team if applicable) to dump all of your DPS in a concentrated area.
• If you have a mercenary or other teammate(s) with you, attack him from both sides - in attempt to not allow the treasure goblin from running away.
• If you have not attacked the treasure goblin yet, DON'T ATTACK HIM UNTIL YOU CLEAR THE SURROUNDING AREA. He will only run away once you start attacking him and if he, you, or any of your teammates aggro more enemies on the harder difficulties - it will get harder -practically exponentially per enemy - to take him down before he gets away.
• Lastly, and obviously, make the treasure goblin your party's main priority [if applicable]. Notify everyone in your party that you see a treasure goblin and wait until everyone is ready to take him down (and the area surrounding him is clear).

The Act 2 goblin near Road to Alcarnus still exists as of June 18, though I had terrible luck getting anything from him.

Start the quest City of Blood, Lair of the Witch and look around the waypoint to find him, very high spawn chance. If you save a prisoner or two in the bonus side quest, you always start at the city entrance and can work your way around the waypoint area to clear it (and spot any goblins). As always, don't use followers or be really careful and run back once you see a goblin right at the edge of the screen.