Add description

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 Powerups
 ========
 
+Powerups spawn from time to time in the arena and grant to whoever collects them a temporary super power.  Powerups last for 30 seconds by default. Powerups will also be shown in the radar and the HUD 10 seconds before they appear.
+
 Shield
 ------
 
 ![](http://pics.nexuizninjaz.com/images/l2ycopxlaclk58xpvek8.jpg)
 
+With the Shield you only take 33% of the damage you would normally receive.
+
 Strength
 --------
 
 ![](http://pics.nexuizninjaz.com/images/suftloljmy2uaj2p2mrv.jpg)
 
+Strength increases the damage you deal by a factor of 3. The force/knockback that attacks cause is also greatly increased.
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