The reason you can't enter a dungeon, pops up when you have not completed a required dungeon, you get an audio sound, and a sentence comes up, would be nice to change that to a second longer, and use another color? The blocks that list the spells you can cast, there is a sentence behind that you can't read.
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The movement in the dungeons are very smooth, the zones are not over populated, you can kite the mobs at very low levels, (run around and let the mobs follow you like they are on a kite string, and hit the mobs with range and you take no damage.) The mobs are social, (they assist each other) which makes it a challenge, the dungeons are as they should. The mobs seem to have good agro range, (range as which the mobs notice your presences) I love the way the mobs spells cast area AE show up as a circle, that you can make all efforts to stay out of the red circle of death..lol