If I remember correctly, Dimensional vortex is a ranged attack that, so it gives an opportunity attack. It's a bit of a gotcha with that power.Dimensional vortex, and from the wording I think it does use the attack roll. It's also 'when an enemy hits an ally' =(

Btw, there is nothing wrong with an encounter being easy, especially if they are fast. I would actually say it makes the game more fun. Just add some harder encounters occasionally. Usually you can do this by using less brutes/soldiers and more artillery and such.

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