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I've had this happen on two characters now; during the build phase, a Tower that I have built recently, and that I have enough mana to build again, won't allow me to build it.

This last time it was on my Monk. I had the 30 mana to place another Ensnare Aura and yet the UI said I couldn't do it. Is there a stat I need to boost to place more than a few of the same Tower?

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2 Answers

up vote 4 down vote accepted

It's possible that you are out of Defense Units.

Every defense (trap, aura, tower) costs a certain amount of Defense Units to place down. You can see this when inspecting a defense, as well as in the radial menu when inspecting your hero defenses.

In the top right corner of your screen should be a number xx/yy, where xx is the current amount of defense units that you've used and yy is the total number of defenses allowed for the level that you're on. If you are out of defense units, or don't have enough for the defense you wish to place, the game will not allow you to put one down.

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There area few things that could attribute to this:

  • Do you have enough Defence Units left to place down that tower?

  • In regards to the monk auras, 2 auras of the same name cannot overlap or touch.

  • There is also a restriction on how close to the crystal or spawn point the defence can be, you can never have an aura or a trap overlap a crystal for example.

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I believe there's also a restriction on how close you can place a tower to spawn points. –  Arkive Dec 2 '11 at 16:41
    
@Arkive Entirely correct! I forgot about that, edited to include that. –  Sorean Dec 2 '11 at 16:43
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