Originally Posted by
Neverbloom
It's up to your perspective, before Mars I constantly stated that Amaterasu was the only must have Kamihime *for fire*, after her arrival I'd argue they're grounded (I said that that because Slash has Yamaraja so he can actually reach the cap with her and Yama has a lot of utility herself)
For Hastur, you can get -30% with D'Artagnan and -15/-15% with Oberon and focus your other three Kamihime in something other than Debuffs, with Hastur you'll most likely still use another Hime for the attack debuff, that's my logic behind it.