Hotfixes -- Updated March 12

[Louiseluvsya-alexstrasza]

@Linxy

Mordretha, the Endless Empress

• Echoes of Carnage periodic damage reduced by 50% on Mythic difficulty.
• Dark Devastation cast time increased to 2.5 seconds (was 1.5 seconds) and increased the size of the casting visual effect to be more noticeable.
• Ghostly Charge cast time increased to 3.5 seconds (was 2 seconds).

Thank you!