Havocrel Annihilators now cast Magma Sludge on a time interval instead of it being based off of their health percentage (note this affects Hard Mode only).
Havocrel Annihilators will now cast Magma Sludge at low health.
I dont believe there was ever a time even the top groups were burning the annihilator in less than 30s. That would require 900k group single target dps. I asked someone from Calamity and they confirmed my suspicion that it was all but impossible. When I read the patch notes, it seemed like they reverted their changes from May 17 on PTS so that instead of a time base magma sludge cast, it was health based. I suppose the U30 patch notes are ambiguous enough to encompass what you are saying though @WrathOfInnos