I want Dark Eyes!

Hoo! You're asking about obtaining the Dark Eye. Unfortunately, you basically just have to wait for a super rare drop or a specific event. Save up your gems strategically and be ready for when the time is right, hoo!

Grand Abyss / Every time Super Lifeform Invasion / Every time Otherworldy Cat Tower / Every time Each Abyss Stage / First clear only Nyan-ko Exam Rewards / First clear only Dimensional Colosseum / Monthly Is that about it?

It might be best to get them from assault stages! I also have characters I want to evolve to their 4th form, so let's work hard to collect those dark tears!