Eclipse was an ability in helminth that was useful for people wanting to use weapons over frame abilities to kill enemies. Now its just a subpar roar, as roar also gives same weapon damage boost at 30%, but roar additionally increases ability damage too.
What pisses me off even further is the simple fact that DE does this sort of $hit to any useful ability (marked for death, roar, eclipse, warcry) but does absolute jack$hit to curb the thermal sunder spam, when they have the data on how that ability has been used.