Yellow Large Crystal is an epic base item.
Obtained from[]
- Final Fight in Batcave: Outer Caverns (Alert)
- Final Fight in S.T.A.R. Labs Research Facility (Alert)
- Krona in Oan Sciencells
- Queen Bee in H.I.V.E. Moon Base (hard)
- Weekly Alert Award II
- H.I.V.E. Moon Base (hard)
- Oolong Island (Alert) (hard)