Cells are used for crafting monsters, stuff like elementium is something you use to help you craft the monsters if you don’t have enough cells in general of that monster. Elementium only works for legendaries and lower, Mythics and Cosmics have their own sources for cell replacements which are Mythic Amber and Cosmic Stardust. You need to have 80 cells of a legendary to use elementium to help craft a legendary, for Mythics and Cosmics you need to have 100 cells, their cell replacements are used for ranking them up not helping to craft. Mythics and Cosmics are not monsters you can craft twice, you can only craft legendaries and lower multiple times, the monsters that are special like Elites, Nemesis, Forsakens and VIPs are the only legendaries you can’t craft twice.
The only reason you can’t craft them twice is because if you had multiple of a certain mythic or cosmic or special legendary it would be too powerful to have a certain cosmic that’s insanely op and have like 3 of them or using multiple of the one cosmic on your defense and on your offense. You can extract other legendaries for certain cells like for nature cells or fire cells or cells of that monster. It would be impossible to extract Mythics or cosmics since you can’t have multiple of them. You can buy cells of legendaries, epics and rares, if on special occasions Mythics but not Cosmics, don’t spend gems on buying the cells, I don’t recommend it since you get those legendaries from other sources like PvP. If you are in a team you can request cells in the chat and other teammates can give you cells, of a specific monster you want cells for, you can’t request for certain monsters though.
Thats all I can really remember but I hope this helps!
