Quote Originally Posted by Unregistered View Post
Strictly speaking, Jormungandr isn't the only eidolon with a -10% atk debuff. Yatagarasu should also have the same effect. Yatagarasu's event is 3 months away; so there's about 8 new events plus the 1st reprint before then. So you still want Jormungandr anyway.
I suspect most people will want one of these two eidolons in their team. ATK and DEF down are two of the most useful debuffs, and getting to the -50% cap without the aid of an eidolon is tough without SSR kamihime. Jorm has the added bonus of having a passive buff that's actually useful for its element.