Going through and trying to fix some of the scripts for myself it seems like BuffPresent is not working correctly?

Something simple like if BuffPresent(cold_heart_buff) Spell(chains_of_ice) I could not get it to work. I am just using that as an example but it seems like the Auras are not all working 100%?

For unholy I couldn't get the Death and Decay line to recognize that I was standing in the buff so I had to use "if SpellCooldown(death_and_decay) >= 20"

I am very novice at this but just something I noticed.

@Bingo176
There was a bug with cold_heart_buff, the id got overwritten by the id of the Legion legandary.
if BuffPresent(cold_heart_buff) Spell(chains_of_ice) should work again (as soon as the fix is online).

For Dead and decay try this as a workaround:
if not BuffPresent(dead_and_decay_buff) Spell(dead_and_decay)