Clash of kings: Guide For Defence And Attack On Dragon Crystal - Purifications! Tips And Tricks

Hi Ladies and gentleman today I am talking about mainly the purifications on the dragon crystals and slightly talking about increasing offensive damage and defensive damage.
Speaking about which crystals to use, what purifications to try and get and what charge side to use (using pink crystal or blue crystal for the charge)

For defence I use: level 25 crystal Gold defensive damage and defensive damage taken

For attack I use: level 28 charge with pink crystal gold offensive damage and offensive damage reduction
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