Quote Originally Posted by sanahtlig View Post
C-type defense down debuffs don't yet exist in our version.

Other options to reach 50% defense down besides Yamata no Orochi include C-type debuffs from the kamihime Cthulu and Thanatos, the Burst effect from the SSR weapons Mag Shureft and Guilty Wrath, and the Full-Burst modifier to Snipe from Dantalion's personal weapon Syaruru Blast.
You are forgetting latest DMM gacha SSR summon (Fraserberg or w/e its called) that has -20% on Eidolon-only frame, but we will get it in about a year or so so... yeah.

P.S. Will it be too much to ask for an Atk DWN calculator? Im interested to know if atk down debuff also scales better at 40%->50%...