Hi,
since the class change, the obliteration build is now closer to the breath build. if you want to play this talent, you can try this macro:
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I have the legendary koltiras belt and the cold heart chest equipped. you need a lot of runes to use obliterate and howling blast as much as possible.
I play with a delay of 0.06. Use alt for chains when you have 20 stacks of cold heart.