Someone posted a question regarding the Improved Area Denial feat. I wanted to clarify that here with a copy/paste
Outside of your turn, you get only one immediate action per round. Opportunity attacks are once per enemy turn.
This means with area denial, where originally, you could only hit one target per use of the power, with the Improved Area Denial feat, you can use the power once per target that enters the zone.
Now, how does this help the essentials grounder?
It doesn't....because the feat is meant to be used with the traditional grounder that doesn't get additional immediate actions with his class.

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“I despise stallions. I ride them as I ride an ugly noble women--smiles for appearances and politics only. Stallions. All personality with no depth. They prance like ponies and trot with arrogance. I always say, respect your mules most of all. A stallion may lead with the king and gather the eyes, but a mule will follow behind…and carry your kingdom.â€
Tsarevick Kazaan
Amethyst D20
http://www.diasexmachina.com