Tower of Oz ring question?

Thanks man , but would you mind if i ask about other rings in this thread?
Like this one: https://fbcdn-sphotos-f-a.akamaihd.net/h...9052_o.jpg
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Weapon Buff – L Ring: Gain LUK equal to 100%/200%/300%/400% of your main weapon’s attack or magic attack (whichever is higher) for 4/6/8/10 seconds. There is a cooldown of 300 seconds.
Weapon Buff – L Ring: duration has been increased from 7/8/9/10 seconds to 9/11/13/15 seconds, cooldown has been decreased from 300 seconds to 180 seconds

http://orangemushroom.net/2014/01/15/kms...-the-seed/
http://orangemushroom.net/2014/02/26/kms...d-changes/