Eureka is meant for casual players.

[Nora_of_Mira]

Eureka weapon is the easiest Relic.
I played two days, I am LV9now, and got 1200 crystals, need 100 more, then I will have my +2 weapon,
just zerg the NMs, you will get 200-300 crystals in 2hours,
it's even faster than grinding tomes in roulette

you're gonna need more than crystals for that last step.